I have used several: summit, ameristep and an off brand, climbers and fixed.
don't care for climbers just because you need that "perfect climber" tree and you can't always find that tree in bow range of good trails etc.
you want a treestand platform-unit that is lightweight, quiet when standing on platform, secure and...a seperate safety system in case of a fall. The safety system is a must; vest/strap system, carbiner hook up2tree slightly above your head when standing, lineman's belt/climbing rope. I've never fallen but had a few slips and thought if I had fallen, my precautionary use of the system would certainly keep me from physical harm or worse...especially when I hunt alone.
One brand of fixed stand is my fav and I own 3 of them: LONEWOLF, an Assault and 2 Alpha models. let's me put these up in 3 different locations and cable lock them just in case as a preventative measure.
with 4 LW portable/removable climbing sticks (EZ to use), I can get 20' off the ground. but buy pre-2010 LW stands, as these are now made in China instead of the USA like mine listed above. Total weight with stand and climbing sticks is around 18-20lbs.