I also like the Infinity. It's a very comfortable carry. It's my pack for those times I'll have a heavier load for casual trips. The rear pockets took me a while to get used to, with the two narrow columns to fill. I haven't had any durability issues, but I don't do any alpine, canyons, or heavy bushwhacking. Zippers are still snug and secure with no real signs of wear. I got rid of the top pocket and some other straps and doodads I don't use.
By the way, you can get a yellow/small at Campsaver.com for $120.