I have owned and used alot of brands over the years and hunt from a climber 95% of the time.  For comfort and grip on the tree my favorite is the older API grand slam with Summit seats, I have 3. I guess I have used them so much over the years, I can put them on a tree without use of a light and not making hardly any noise. My second choice if I'm hiking a long way in is a Summit Viper Elite SD (round tube) with mesh seat. With a XOP carry system attached. I have added a shooting rail extension on all of my climbers to make the shooting rail alittle taller.