I'm new to 4WD buggy myself. Last December, I decided to get the Losi XXX4. Although I don't have experience with the CAT, the Losi proved to be a good choice. Had some experience with other Losi vehicles like the Street Weapon and the XXXS. The single belt idea is great and maintenance is easy.
The cat is a good car but where I live,parts are hard to get and no one else has one,so if you break and you dont have the part, your race day is done.The Losi is also fast and where I live the hobby shop has all the parts,plus I think the single belt is a little quicker out of the turns,A few of the parts seem to break on the xxx4,more than my cat did.I hope that with the xxx4 it brings the 4x4 class back.