There are cheaper models, I think MS has three optical models. Mine is the mid model, cost me 30-40 bucks. If you do graphic design don't get it, it doesn't have very minute precision. Some people have said they don't like them in games either, I've never had a problem however, used to own in Counter Strike. As for surfaces, the desktop works very well, no need for a mouse pad. Just about anything that isn't reflective, metallic, heavily polished, etc should work fine. Is it worth getting? Well it is pretty cool, no cleaning of the ball, but what got me is how smooth it was since it doesn't have a ball. The scroll mouse is also very good, I have had mine for around a year and the grooves on it have not worn down, unlike my old MS non optical mouse.