I bought a Jaguar and a Corvette.
The Corvette works fine - plug and play with Windows 7 - no problem.
The Jaguar doesn't want to track very well, however - so it's defective. Contacted the company but haven't heard anything back.
Discouraging that their website says they were bought out at the end of the year, so I'd be surprised if I get a decent response. Not worth it to pay shipping to return it to woot, but will definitely keep this in mind the next time I order something through woot.