I know there is controversy over the FBV and people are concerned about how in theory, there can be a bad sharpening and the margin of error is very small. I think the bottom line is, do you trust the place you go get your sharpening? Forget FBV or any other type, do you actually trust the person doing the sharpening? The guy I go to has FBV and I know and trust him completely that he would only do something that he truly believes will help me. If he didn't believe in it, he wouldn't have it there. If he didn't have FBV, I wouldn't go elsewhere to get it. I have had mine and my 3 kids skates done by him for many years. I like my skates sharp so I have them done every 6 to 10 times on the ice (approximately every week and a half to 2 weeks). I have never, ever had a bad sharpening. Would I go to the local sports retail chain to get my skates sharpened? No, no matter whether they have FBV or any other kind, I would not, because I don't trust whatever kid happens to be working that day to sharpen my skates. I think it is better to be more concerned with the person doing the sharpening than the machine and stones they are using.