Maytom has great advice about seating. I'd add to that with recommending you also get a camo beaded seat cushion. I sit on my beaded seat on top of my H.S. Strut webbed seat, and take the Elite drop down seat off my vest and use it for a back support/rest/cushion against the tree.

Lately, I've been contemplating the purchase of an internal-framed vest like the Little Big Horn gobblers lounger, because there aren't so many trees to lean up against out west.