get it at walmart for 20 bucks. I find it utilizes different fibers of the pectoral muscles more than regular pushups. And if you do the military work out you feel that shit works big time.
I stopped lifting weights in march of 07 and in jan 08 i bought these perfect pushup. Starting using them on random days. I then bought a bench just a few weeks ago and starting lifting weights again. Now it has been over a year since I benched and i lifted 205 with not too much problem.
When I would workout on and off for a few months I would have problems lifting 205 if i took more than 2 or 3 months off.
So take it how you want, but I think the perfect pushup regain and help me maintain my strength.