it is a lot of money!
it is a class 2 hitch, 350# tongue wt. 3500# tow limit. very hidden when the ball hitch is not installed, and very clever attachment process.
it may add a few dollars at re-sale, since not many X3's are tow vehicles. with that said, it is indeed a very capable tow vehicle, especially with the 35i power plant.
see:
http://x3.xbimmers.com/forums/showthread.php?t=594010