Remarkable shipping time from seller Stealth Rabbit! great product!Great product, quick shipping.Great sharpener, use it for many curved blades which do not sharpen well with a stone.One of the sockets is a tad loose (came loose from factory), but managable....but seriously, don't let kids under 10 anywhere near knives.This sharpener is amazing. Words cannot express how much better and more effective it is than the tiny little pull-through pocket sharpeners. To the point where I'll never be using one of those again unless backpacking weight forces me to rely on one. Simple and intuitive to use, it seemed to sharpen up my knives well, even the ones made of tougher steels that are harder to sharpen. It's lightweight, and the side rotates to reveal four storage compartments to hold the rods. No lost parts, no learning curve, just a nice easy-to use sharpener. By feel, it seems to weigh just under a pound- about as much as a second knife would weigh.It's not light enough to justify taking on a trip that's only going to last a week or less, but if you're counting on sustained use of an axe in long-term (>1 week) survival situation for generating firewood, I think it would actually justify the weight in your pack. I would like to see them release a lightweight version with hollowed-out sharpening rods and a lighter polymer block...I bet they could get the weight down to under half a pound.I've had a bumpy ride with these sharpeners. First I bougth the ceramic version of the 4 rod box. It does not have diamond sharpeners for the medium grade. Not only did it not do nearly as good a job as this version, but one of the medium grit rods had a permanent bur which made it un-usable so back it went. It also had very wobbly rods, more on that now.This diamond sharpener has some issues that all lansky boxes have and that many people have commented on. The rods wobble in the holes. This is not good. You can't sharpen effectively with wobbly rods, and a floating angle. This means you have to hold the tops of the rods while you sharpen to keep them steady. To me this is not acceptable, and I may be returning it and just biting the bullet on a spyderco sharpmaker.That said, I own a crappy china knife, and a high end hap40 steel spyderco. The spyderco could shave out of the box, and is very easy to maintain, but the china knife, I'd never gotten to shave or even close on the ceramic box but with the diamond box, I got it to shave quite easily. Of course it was awkward and annoying holding the rods in place, but for a $20 sharpener, it does work quite well. I like using the "slicing bread" method of sharpening that they recommend in the instructions. It works well and it's fast.So i don't know. For the price, this technically is a great sharpener, but the wobbly rods are really annoying and must be steadied to make this sharpener really effective. If I wasn't removing them constantly I'd just wedge something in there to stabilize them. On the other hand, I mostly use my spyderco knife, and it really doesn't require much sharpening, so this box is probably enough.If it weren't for the price, and the fact that I'm not totally sold on the spyderco's sharper angles on the sharpmaker, i'd definitely go for the upgrade.Does the job. I have had a steel for years but there were a couple knives that weren't that sharp from the factory. With a little work, this put a very sharp edge back on them that I can hopefully maintain with the steel. This isn't idiot proof, in that it doen't hold the blade at an exact angle every time. It's simple enough to get the prescribed angle by simply holding the knife blade perfectly vertical. But there is room for error, I haven't mastered how to put a shoulder angle and then an edge angle quite yet, but I followed directions and ended up with an edge that felt very sharp by feel. Not sure it's razor sharp or sharp enough to cut a paper without holding the paper rigid, but it's a lot sharper than the knives were.I don't anticipate having to use this much at all, as it's more for removing metal and restoring an edge that's been worn off. I'll use a steel to maintain the edges on my knives until they really can't be steeled back to sharp, then use this.This may be a little tough to use on longer knives, as you'd have to pull a lot more than move downward. To sharpen a 10 inch carving knife, it would be difficult unless you sharpened in two sections. For a steak knife it's fine, though I did have to do separate passes to sharpen the curved tip of the knife.I've been carrying the original addition of the Lansky for years and I liked them, these are one step better. Honestly, I use the box for storage and protection. At my level, I could just hold the rods and sharpen a knife. The box does work, it's a tad universal but it works. Obviously, it is NOT the best choice for sharpening a knife in the home but in the field, it's a great choice! I've been sharpening knives since boot camp back in in the 1990's. I learned on Arkansas Black Stones and Japanese King Wet Stones. I thought they were the best deal in town. I had buddies using sanding belts and sandpaper with fantastic results. Decades later I was turned onto the Lansky and the DMT Diamond stones and I fell in love. You aren't going to reprofile a blade with these but you can retouch your blade to shaving sharp!Diamond stones move so much more steel cutting the job in half! The Ceramic rods in the original Lansky were good at maintaining your blade in the field but the diamond rods are that much better! The only downside to the Original Lansky were the ceramic rods, they could easily break in the field. This gave the edge to the DMT stones! Now that Lansky uses a heavy, well-made diamond rod this is a no brainer.Just keep in mind what these are used for, this is for quick maintenance not reprofiling. People that say the Lansky doesn't work are NOT honing their knives first. You HAVE to hone your knife either before a job or after! Every...single... time! Do this and the Lansky will keep your blade sharp and dependable. ​I was trilled when I saw this product. At the time it had 13 positive reviews, can I go wrong with Lansky with 13 positive reviews - sure I can't !I was so WRONG. First it arrive in the smallest amazon packets, which is okay, no need to waste more plastic and boxes. However as soon as I opened the Amazon carton box - one of the ceramic fine rods fell on the ground. And of course - broke in two. As it appears - all of the rods were outside of the wooden box during transportation, which is VERY poor planing. The plastic packing was weak and poor and got half smashed and therefor - opened. That's how the rod dropped from the plastic packing and was staying in the carton box only and as soon as I opened the carton box - it felt on the ground. However that's just half of the problem. I though - it is okay, I'll buy a spare, I saw they sell them, so I started sharpening a knife with 285 bess (measured on "Edge-On-Up Professional Edge Tester"). 285 is pretty sharp, but I wanted to get it to about 200 bess - that's how much I was able to achieve using Spyderco Tri-angle Sharpmaker, which cost twice as much as Lansky's product. So after the first attempt - I got 295 bess, which can be read also as "no change". So I did another 40 strokes on each side of the knife on the diamond, then 40 strokes on each side on the ceramic and measured again - 485 bess. So instead of getting less bess, I was actually be able to screw this knife edge pretty quickly. Went to fix it on Spyderco and got it at 210 bess from 20 strokes on each side.So this made me wonder - they work on the same principe, why Lansky made it more dull instead of sharper ? I placed both lansky and spyderco to each other and immediately noticed on the 20 degree angle rods there were differences. The attached picture shows the difference. Obviously the plastic base of Spyderco is capable of maintaining a better angle - the bess results show it. While those few millimetres difference on the Lansky rod are probably pushing 1-2 degree more - making it 21/22 degree and I guess that's where the difference comes.My recommendation is to go with the more expensive, but far superior (also has much longer rods, which is great advantage for longer blades) Spyderco. The price is about twice as much, but it is a well built, well packed (you wont get broken product on arrival).Lansky is like cheap russian "Lada" carSpyderco is like a nice VWFor even better results - take the T4 Tormek, but it is much more expensive. However it is like MB/AUDI :)I can use a stone but this is so much easier and gives a sharp edge on all my knives. You can still tell which are better steels though - as some get razor sharp edges and other knives not so. Good investment.Very happy with the sharpener. It take a bit of time to do harder steels but for soft stainless steel it does the trick with just a few strokes.This is a cracking piece of kit. Simple to use and gives an accurate and sharp edge to your knives.works a treat