I only have the Carryall, but I absolutely love it. It's the perfect carry-on size. I take it on all my plane & car trips. Even though I worry about the vachetta, it does have feet so the bottom doesn't touch the floor. (Or if you're really paranoid like me, you can put a small towel or airplane blanket underneath when you stow it on a plane).
I looked into the Keepalls, but they are too big & get too heavy for something w/o wheels.