I have an older version of it, and mine is reasonably decent. Wheels came true and balanced, and it's served me for almost six years.
When I bought it, I thought that the big, slow wheel would be very useful, but I have found otherwise. For my turning tools, the slow wheel is too slow. I have used it on a knife when the knife really needed it, but overall, I generally go to the other wheel virtually always. The big wheel that came with it is fairly soft, and needs to be trued quite often.
If you have work for which you really need that slow (or wide) of a wheel, then you might want to try one. But otherwise, a 1750-RPM or variable-speed 6" or 8" grinder would be better, IMHO, for sharpening your turning tools. And hey, Woodcraft has their 8" 1750RPM grinder on sale right now...
EDIT:I should say that mine is a combo - the 10" slow wheel, and a 6" full-speed wheel. I just realized that I think they make one now with only a slow wheel - and that the one with only a slow wheel is plastic. Mine is all metal, like most grinders. Mine is probably sufficiently different from what he's talking about that my unit-specific info doesn't apply. The point about slow-speed vs. normal speed still does.