OH I LOVE this set. WONDERFUL! First of all, it's a DMT product, and their dinomad crystals are superior to the competition to begin with. Normally, dinomad sharpening stones have the characteristic honey-comb appearance. The purpose for this is to help remove the metal dust created by the sharpening process. The dust falls into the honey-comb pattern, keeping the cutting surface clear. That's great, and it works very well on knife blades. But that pattern is a problem when sharpening tiny things, and pointy things. Anything small enough to partially fall into a honey-comb hole pattern requires a continuous sharpening surface, like these! I have only had this set for a few weeks, and have used them a zillion times. Most recently, last night. My wife shopping (Amazon, naturally) for yet another pair of tweezers. I asked her to show me the dead ones, and she brought down her tweezer grave-yard box. In short order I had re-dressed those tweezer surfaces to better-than-new performance. Then I went after my heavily abused tool quality tweezers, and THOSE are all now good enough to pluck Tinkerbell's nostril hair. (video pending) Here's something else last week, I was shopping for a new head for my electric razor. It's a very nice 3-head Norelco. But when the head wears out, it's expensive to replace. I took the cutting blades out, lubricated just the fine sharpening plate with a few drops of water, and gave the cutting surfaces a bit of a polish. Holy cows! It's like night-and day difference! With just those TWO items sharpened, this set has more than paid for itself already. Now THAT'S value. Despite their tiny (credit-card) size, they are fairly heavy, so I was not carrying them every day. Well, I've changed my mind. They are just TOO useful to be without, and now they have a permanent home in my Maxpedition Versa-pack. (a manly guy satchel, not a fanny pack . So there.) Now, ONE little warning: These are a set of tools, NOT some kind of magical sharpening machine. No more than a nice socket set is a magical tune-up macine for your vehicle. I see negative reviews here on perfectly wonderful sharpening sets, which is absurd. It's like saying that your car runs rough because your craftsman socket wrench did a bad job tuning your car up. Every tool has it's physical properties and limitations, and sharpeing requires a little bit of knowlege and skill. The more practice you get, the better your understanding becomes. (well, for most people, anyway.) If you're new to sharpening, you will get much better results if you do a little bit of free reading on the Internet, and watch a few YouTube videos to see how experienced people do it. And yes, you'll find even the Pro's contradict eachother all the time. Don't worry about it. ANYONE can put a really decent edge on a piece of steel with a little practice. (I recommend DMT's other knife sharpening products as well.) PERFECTION well, that's another story all together. There is a lot of obession in the sharpeing game. Take your skills as far as is comfortable for you. Just keep it fun. -Berk