I used the jumpsoles with the proprioceptors nearly four years ago for over six months religiously. In that time I saw my vertical increase significantly. I'm 5' 6" (on a good day) and at my peak could dunk off two steps. The program works and the jumpsoles are much more effective than the Strength shoes. The proprioceptors are by far the best balance workout I'd had.
Marriage, two children, and nearly thirty I'm starting it up again and recently purchased the 5.0 system. Pretty much the same as the original and just as grueling.
I would recommend this product for anyone serious about testing their physical limits. If you follow the program it will be tough. You will see your vertical decrease before you see it increase. Don't be discouraged, hang in there, and trust me your perseverance will pay off in the end.
If the above statement dispirited you, maybe these aren't for you.