perfect push-up?

i've seen a lot of tv advertisements for this thing.

My first instinct is that its a tool thats bound to produce results as it requires you to do pushups - which are beneficials with or without the device.

It claims its designed to increase punching power with the rotational mechanism. I'm not sure if this is a lot of hot air like those ab rollers that were popular a few years ago which hurt like hell but produced little to no results.

Has anyone actually used these things and if so, have you noticed any measurable improvement, or is this just a waste of cash?