Got mine, agree with review
I had to install Windows 7 in advance of its arrival as its not XP or Linux compatible. Installed it and found it smooth in places, jerky in other. But once I realised it uses light to track and my computer has many different light sources around it I realised it was getting confused. Moved the computer into a single light source area and it worked quite well. Then thought "what the hell am I doing". I can't think of any other peripheral I would have done this much to use. Not as useful as I thought it would be when I ordered it at the start of last year. Hopefully some of the Raspberry pi hackers will make something useful out of it