I've bought a few over the years and come to the conclusion that a combination of tops and bottoms is best. One thing I don't want is a base that ins't adjustable easily. I use a North star base (not sold any more) and a summit cobra or lone wolf hand climber top. The NS base is roomy, light, and easily adjustable along with an ability to be used on large trees. Just a squeeze of my hand on the lock with a lift of the base cinches up the belt.