My son first tried the 100/75 and I noticed some chattering when he stopped. Previous to FBV he was skating on 9/16th, so I assumed there was just too much bite. I am now putting the 90/75 on his blades and I have yet to see the chatter issue. Also I have not notice an increase of nicks or burs to his edges since going to the FBV. He has been skating quite a bit lately outside on our rink, or the pond, which tend to be a little harder on steel. The FBV seems to hold up well under these conditions. I now have enough confidence in my sharpening ability to give others the oppurtinuty to try the FBV. I gathered up the other coaches skates and went to work. Last night all the coaches were giving it a try. It was like a bunch of kids with a new toy they were all grinning from ear to ear, and commenting not only on the amount of glide you get but also the byte you get when turning. It was hilarious to see a bunch of grown men out doing power skating drills in the corners just to see how the FBV would perform, with the biggest smiles on their faces. All of them were coming from 1/2 and I put them on 90/75. It really is a unique expereince the first time you skate on it. The sharpener takes some time to get familier with, but with a few conversations on the phone with the fine folks at Blackstone, I have no problem getting a good consistant sharpening with each set of skates I do.