Support BladeForums! Paid memberships don't see ads! I have order a few times before from Gritomatic and I have always been pretty happy with everything I have purchased,I first purchased the Venev Industrial Diamond stones for my K02 knife sharpening system and I got the Venev stone's because they have diamond mixed right in with the grit and figured they would sharpen S110v steel faster and better as I have a lot of Spyderco knives in S110v steel. I had emailed Konstantin the owner of Gritomatic a few times and talked to him about the kind of steel's I have to sharpen and he told me that he was getting in some Metallic Bonded Diamond stones and Metallic Bonded CBN stones to test and when I ordered a second set of the Venev stones he threw in a 120 grit Metallic Bonded diamond stone and I tried it and really liked how well worked so when he finally got in his next shipment from Poltava Diamond Tools I decided to go with a full set of the Metallic Bonded CBN stones witch there are 50,120,400,1000,4000,8000 grit. All I can say is these stones should be called for a brand name Rabid Piranha's because that's the best way I can describe them and to call them just Piranha's would not do justice as to how fast they cut. I started off with my Spyderco Paramilitary 2 with S110v blade steel and used the 50 grit stone first and it really removed metal fast and I mean fast,I counted how many strokes I did and when I sharpen and I do full stone length pull's back and forth while moving down the edge towards the tip and back again to the ricasso and it was a total of 16 strokes and I flipped the knife twice in the K02,the 50 grit Poltava is so fast at removing metal I would not let anyone who has ever used a guided system before loose on a knife with the 50 grit stone because of coarse like most people a newbie is going to think more is better and really grind the metal way much and just shorten the life span of the knife. The best way I can describe how the 50 grit Metallic Bonded CBN stone worked is to say that it just cut's threw S110v like it's nothing just plain and simply put it's easier then taking candy from a tied up baby,the grit also produced filing's that looked like long metal hairs that look like they were made by a power tool then a sharpening stone,the rest of the grit's also removed metal very very fast and all I can say is that you can sharpen S110v much much faster then with any other stones that I have tried and the only ones that come close are the Venev Industrial diamond stones and they are slouch either when it comes to sharpening S110v or any steel for that matter.I also stropped the edge with Poltava CBN Paste and I started with 10,7,3,1,.5,.25 Micron and I used Kangaroo leather strop's on my K02 that I made myself. One thing to mention about the stropping paste I found it to leave a thick waxy film on the edge of the knife when stropping and figured all I was doing was stropping the CBN paste as the layer was fairly thick,I asked Konstantin the owner of Gritomatic about how to apply the CBN paste and he said to just wipe it on but and I asked him about heating it up with a hair drier and he said not to as I may damage the leather,I got fed up with figuring all I was doing was stropping a waxy film so I gently heated up the strop's after I had applied the CBN paste just to point where the waxy stuff absorbed into the leather and sure enough it stopped leaving a waxy film on he edge,it still left a little bit until one side of the edge was done but I just wiped it off and after that it was fine. The Metallic Bonded CBN Stones are 100.00 USD each and I know what a lot of people are going to say that's to money but no not really if you stop and think about,these stone's are bonded with Tin and Copped and they wear extremely slow,I know the Venev are also slow wearing stones are slow wearing as well but if I had to guess by how much abrasive is released from the Venev Industrial diamond stone's when compared to the Metallic Bonded CBN stone's I would feel comfortable saying that the Metallic CBN are going to last 10 to 15 times longer then the Venev stones if not longer yet so you do the math. This is the factory edge and what it looks like and this was the first time sharpening this knife. This is after using the 50 grit stone. This is after I used the 8000K diamond stone. This is the edge after I got done using all the different grit stropping paste's. My final comment's on these stones would have to be they are certainly worth the price if you want a stone that's cut's steel's like S110v at God like speeds,also as I said before I know people are going to gripe about the cost of these stones but don't forget they aren't going to wear out anytime soon when compared to other stones and I know some are going to say the same thing about Shapton Glass stones but I have the Shapton Glass as well and find the to be useless and frustrating on steels like S110v and make a task that's supposed to fun into something dreadful but then again the Shapton Glass wear so long is because they have a very hard binding agent and cut slow because they are Aluminum Oxide.