Check out some of the fun to be had with these:
http://www.youtube.com/results?sear...l156000l24l13l0l1l1l2l422l2814l0.2.4.2.2l11l0
IMO, they're cooler in many ways than a full-track setup.
i thought the mattracks conversion was supposed to be a half hour affair, shouldn't you be done already?
No really once set up its like changing tires.