I have an AC 1M 900 with a 159" challenger, and King Cat 900 with an attack 20 162". I love them both. With a large motor to pull the track, high handle bars, long foot rails, know where to put your feet and know when to pull, why bother with anything shorter, unless you are a flat lander like I was? Also people knock the attack 20, but I think these people aren’t riding them in 3' powered, where it's mean to be. But you have to keep in mind.. were I ride, how I ride and my size (6'4" and come in at 255lbs). So a long track might not be for everyone. Learning on a short track and moving up will give you the skills, it did for me. Out here in WY/CO its about skill when the sleds are all over 144".