Been running a set of the Precision clamps on both my race quads now for years, plus I own a set of Flexx bars. The Flexx bars were ran then for a while on my backup 450R, now they are on my 250R. Kind of hard to explain the differences, guess the easy way out is the more aggressive I ride, the more I prefer the Precision clamps. Just out for a trail ride, I prefer the Flexx bars. I only really notice the benefit of the Precision clamps while standing, but I feel the Flexx bars while standing and sitting.
Doug