Ummm, I 'm still a novice in sharpening. :D Yet, the Turbo Spinner portable that I have has been very easy to figure things out (with the regular spinner dresser) - sharp even edges and neat smooth finish Today I tried the 90/75 FBV. The spinner dressers (even the regular non -FBV ones (on my machine) seem to be a hair off in terms of alignment to the wheel (that's what I think judging by the wear line on the dresser). I didn't spend much time trying to play with one of the edges by adjusting the holder. I just clamped the skate the other way around and was done. Sharp even edges and smooth finish. I haven't skated on them yet, though. But looks very good so far.