I'm dipping my toe in AA. Have been UA Gold/Platinum (and last year 1K) for some years. However based in PHL, the *A options are diminishing -- and I really am not enthused about doing travel out of EWR (I've got a trip to Italy in June thru EWR as a last valiant attempt on *A). Hopefully I can grin and bear kettle class for the balance of 2014 till I get at least first level status on AA (I've got a business class trip to DEL via LHR on BA in July that should help quite a bit).
Probably will say good bye to about 700K lifetime miles and need to really burn up a goodly number of my UA miles.