Well, if you want to buy mine, I have it for sale at Amazon.com for cheap, or send me an email.
It's a fine game all around, except I personally find the handling to be much more arcade-oriented than I was expecting. The cars feel very light & twitchy and have a lot of grip. If that doesn't bother you, then I think you'll enjoy it very much. There's a nice selection of real-world racing tracks, real-world race cars, real-world racing series, excellent car sounds w/ nice in-car dash views, & a good sense of speed. There are 20 cars in a race which is quite a nice change from most racers which only have a handful of cars...and the framerate is super-fast.
Guys, I just discovered that there is a code you can enter that eliminates the twitchy handling. I'm going to hang on to the game until I give that a try & see how I like it then.
Paul, I definitely recommend a rental first on this one if you're looking for super-realistic handling.
PS Jon, the game goes for $39.99 new, which is $10 less than most new Xbox games so you can't really go wrong by picking it up brand new. I'll let you know though if I do change my mind (again) & put it back for sale.