The only good thing is that the reservation is free for OWE and OWS. No reason to post anything on AY+ (except some hotels and credit cards). I would not achieve any status with AY+ and even silvers pay 50 %. I will easily earn OWS with BA in the future and I am able to maintain BA Gold status a couple of years before the Euro qualifying levels change. Unfortunately, AY flights earn less Avios points than BA flights so I have to fly more often via LHR but with better onboard service it is not too difficult a choice at least to the Americas.