The only word I can use to describe this model is, magnificent. Can't praise it highly enough. I've built a few ROKR kits, and this in my opinion is the best one I've done. It's really well designed, fits together perfectly and there are plenty of spare parts, which I actually didn't need. I was slightly worried about the gears fitting together, but once built everything moves perfectly, including the keyboard. Well done ROKR on producing a challenging, and rewarding kit, which is a pleasure to build.