Also got a Trail-sling, never thought it was very comfortable, doubt I could last an hour in it, but for $20, what the hell. Have a PICO, and that is very comfortable with super quick set-up/take-down, but a bit heavy and large for the bike.
These air mattress chairs have always proven to be comfy for me, for like a pound of weight and almost no volume, everyone's got them. Only problem is you're sitting on the dirt or need a ground cloth.
Gotta try a Kermit one day.