Just as an addition, I have Asia Miles and the main drawback for me is that the miles automatically expire after 3 years regardless of activity.

Geordie

Asia Miles can be renewed for another 3 years beyond their original expiration. However, there's a fee of $10 per 2000 miles.

In my admittedly limited use of Asia Miles, I've also found that they have weird restrictions on which routings qualify for mileage credit and which do not. For example, they gave me credit for SHA-CKG but not CKG-SHA on MU (same fare class). I spoke with a couple of different agents thinking it was a mistake and they all told me no mileage credit for CKG-SHA :-/