Hey slugman,
my advice would be not to buy the Summit Mega Bucks Python model. I did, because it is a sit/stand climber, rated to 300 lbs. I am a fairly big guy as well, but well under 300 lbs, and the dang thing broke the first day I used the sit-down climbing method. The metal bar was not strong enough to hold my weight (240 lbs) I guess. I don't know if it is still being offered in the catalogs, because I haven't seen it anymore, but if it is my advice is to not buy this model. The other Summits are supposedly very good though.