My only worry is that A3 is too good to be true. If a lot of members sudenly start using A3 for status and elsewhere for crediting miles, I could see them changing the program. It seems some of the T&C are vague, so there may not be a lot you could do if they want to change.

This could easily happen as once you have status, there is no real reason to keep crediting to them as burn rates and change rules are not so good