Buy the Summit, hands down. I'm 350 pounds and have had absolutely no security issues as far as staying in the tree goes, even in one shagbark hickory. The stirrups are AMAZING for climbing, no screwing around with straps to get your feet into, and for comfort, no one beats Summit. If you go with the new 1800 Max from Summit,I will be jealous. The goliath used to be the biggest one, but the 180 is bigger, mostly like having a Barca lounger in the tree!