FB One size. I hated them. Almost swore off CDing altogether because of them.
As much as I love the way they look and fit, the perfect size FBs arent much better. After 3 months of use, ALWAYS being line dried, nine out of twenty of my diapers have delaminated. Infuriating.
I hate any AI2 system. Drives me nuts .. I don't get the hype. Definitely more of a pocket/AIO kind of gal, I guess.