in my limited *A experience, integration seems ok to me in N America.

Air Canada and United have always seen my *G status and i've never had problems with reciprocal lounge access. A small but noticeable perk is the ability for me to secure E+ seating on UA with the *G status - not as great as when CP was partnered with AA in 1W (when we could use our u/g certs to u/g on AA metal!) but still not bad.

No problems with priority boarding (although they seem to let everyone on at once like a bizarre quarterback rush play). The one inconsistency i've occasionally had is with priority check-in. Sometimes the lines aren't clearly marked with *G so it confuses both me and the check-in agent, but again, it's not bad (DEN was the worst for some reason!).