OK here are my findings. Last year at the 94.7 expo I had the test done on me and being duly impressed that I could not be pulled over while wearing heels, I bought a powerbalance band and wore it all the time. I can't say that my cycling performance improved noticeably but it didn't get worse. I started running around the end of April beginning of May this year and at the end of July picked up an ITB injury due to an imbalance between my left and right core muscles (physio's words not mine). As part of the physio I had to do all sorts of strengthening exercises and you guessed it, balance exercises. Turns out my balance was pretty shocking. I could not balance on my right leg whatsoever. When I started having to balance on a bosu the physio initially had to hold on to me so I didn't just fall off the thing. All this while I had my powerbalance band on. Took it off - no difference. Put it back on - no difference. So I have tried the thing (and donated my R475 to "skoolgeld") and it seriously didn't help my balance. I have no scientific evidence to say yay or nay but personally I don't think it works and any improvement a person feels is due to the placebo effect.