people i know seem to like some parts on the rev 3 better than the carpet knife, however they found this out the hard way after they bought a knife the speedmerchant rear links to the pod are captured and are more secure, and also you can move the batts forward and back a bit to adjust to track conditions. the speedmerchant also has the old style front end, which some say is better than the new dynamic strut system included with the knife. basically your call, do you like red or blue lol. but the speedmerchant might be a little better...