I owned one. Felt the metal was too flimsy feeling. I thought it would have a smooth roll like a well oiled set of gears (imagine a bicycle gear), but it wasn't. It was more of a rough slide like an old light switch where you pull on a chain. They did give me a full refund.
Cool design - check out the video on the website to see how it moves..
I was definitely going to get this for my sister, who is an engineer, but I cannot if it is a 165 dollars...oh well, at least I can admire it! Thanks for sharing!