I think it'll take some getting used to - have to remember to keep your head still or you end up looking at your feet when you're braking for a corner!
Great for GTR and GTL also Falcon4 - some people have had difficulties getting it to work in MS FSX, but it's fine with the earlier ones. Does take a bit of getting used to, but it really does work pretty well and it's tiny - about the size of a laptop webcam.