Flew 22 AA segments in last 3.5 months as SL/Ruby, never had issues with MCE selection, PriorityAccess, or checked baggage. I did have to shell out $25 for 1 bag on an AA-codeshare, AS-operated LAX-SEA flight, and missed out on mileage credit for a few O-fare tickets, but it was probably my fault for not double checking.