I have an ABA one in the library I'm baby-sitting. It's ummmmmm....a bit odd if you ask me. The straps are *very* thin, so is the waistband, and the body is very small with quite a narrow seat. There's no padding on it at all, so combining that with the thin straps I'd be guessing it'd get pretty uncomfortable after a while. I'm about to head out soon, but if you like I can dig it up and send you a pic when we get home.

I'd go the didy-tai, or if $ is an issue, see if you can scare up a secondhand babyhawk or maya-tie.