Ya, the Maverick track was the stock track on all the 4 stroke mountain sleds since like 2006. At least all MTX Apexes and MTX FX Nytros. Seems lots of guys thought that track just wouldn't push the sled trough the snow very well -- seemed to get stuck in places other tracks, like the Extreme, wouldn't get stuck of in place on the same sled, same spot, well you get the idea. Lots of guys replace the Mav track with one of the two tracks you mentioned, which it seems are consensus the best Mountain sled tracks on the market. Will be interestingvto see how Yammi's new track, the Ascent performs. It's the track on the 2012 MTX FX Nytros.