So, it's a 65cm exercise ball. It's purple. Made from a high quality material, that doesn't smell like gross plastic. I haven't had any problems with it, and even my 260lbs friend was bouncing around on it with no problems.
The pump it comes with takes forever to pump it up, but that is the same with any pump that comes with an exercise ball. It also comes with a basic exercise pamphlet which is fairly helpful, but youtube or the internet are far better resources for ball exercises.
Buy it! For the price, an exercise ball is a cheap way to burn some more calories. Also works as an extra chair.