I have been using it for 3 or 4 years. I use it for active recovery and sometimes warm up (but not often for that purpose). I have used it a lot for rehab and used it following surgery.
The active recovery works quite well. I recovered from a torn muscle a couple years ago in staggering time. My PT was stunned by the quick recovery.
Personally, I have a great deal of success with recovery. It certainly feels like it works out lactic acid and crap from the muscle. It does increase blood flow. Helps get the soreness out after races and hard workouts. I have definitely gotten my money's worth.
Regarding the muscle building claims - I am highly skeptical. But, I do not useit for that purpose.
If there are no dogs in Heaven, then when I die I want to go where they went. - Will Rogers
Emery's Third Coast Triathlon | Tri Wisconsin Triathlon Team | Push Endurance | GLWR