I have the the 180 max ss,I am 6' 2" ,275 lbs. I like it.The sling seat has adjustable height and so far as moving the seat, I haven't tried it in the the tree but it has the rectangular type of buckle that you slide throught a slot. Here's is their web site ,you can make all of the comparisons here.
Http://www.summitstands.com/