One of the points that's important to realize is that lots of people have 'tried rollers,' fewer people have trained on rollers, and VERY FEW have used resistance rollers. This is because of the relative rarity/high cost of resistance rollers. I will be the first to point out the shortfalls of standard rollers. They do have their place, but are limited in training value. Resistance rollers are entirely different, and my entire discussion in this thread has been in reference to resistance rollers. I'm also careful not to de-value trainers. I also own a KK Road machine, and used it regularly before switching to the resistance rollers. It is very high quality, high resistance and a great training tool.... But it does NOT have the same impact on my form and smoothness that the resistance rollers do. It's like night and day. I'd challenge anyone to suggest that one leg drills on a trainer utilizes the same musculature that doing the same on resistance rollers will. Don't believe me? Go give it a try.

-Jeremy