I prefer the API hands down. IMO they are quieter, more comfortable,and they fit a wider selection of trees. The Summitt won't open up wide enough to climb a lot of the trees that I climb and the one I use in the pasttended to squeak pretty bad on some of the scaley bark trees like persimmons. I think they have gone to some better seats in the last few years so I am not real sure how much difference there is in comfort anymore but I hunt at least 10-12 days a year from daylight until dark out of my API with 0 problems and I don't set real well because my legs start going to sleep etc.. I don't have those problems with the API though.