Here's the Canty next to my (tired) friend's 'Cat. Notice I shoved my 'Cat's inflatable backrest in the babysling seat.
And a couple of me sitting high and dry!
The inflator bag works brilliantly once you get the hang of it. Granted I'm not quite as high as in the 'Cat, but my butt is right at water level. Also not as stable as I'm able to rock the rig back and forth and my knees are somewhat pressed up against the bottom of the tube (the original intent of the seat had the legs angled down) but it's comfy for hours no problem. I can see it being a bit cramped for a bigger guy though.
I need to find more excuses to hit the high country now!
BTW, know of anyone who would want to sell one? I have a friend who may want one...