I bought a Power Ball due to me suffering with acute pain in my elbow after sitting at a desk at work for long hours. It arrived three days earlier than the estimated delivery date, which is obviously a great credit to Amazon. The parcel arrived in a huge Amazon box that could have fit about 10 Power Balls in it!
However, that aside, I unpacked it and immediately wanted to test it out. After about 5 unsuccessful attempts to get the thing started, I finally managed to bring it to life. I was immediately hooked! You can instantly feel the power that is generated and it isn't long before your muscles feel like they are working hard. I know I said I bought it for rehabilitation but I've got a competitive side and wanted to know how fast I could get it. After 15 minutes I managed speeds of over 6000 rpm, but later that evening I managed to get a top speed of 10,702 rpm, I thought my arm was about to explode!
So, although I cannot yet comment on the rehabilitation side of this product, I can say that it is an incredible piece of kit that will have you hooked from the moment you take it out of the box!
Buy one! You will NOT be disappointed.