Thanks for the replies guys.

The biggest advantage for me is the 200% in C class. As was said above, one of my OSL-MEL returns would put me just short of gold for the year, as opposed to TG who only offer 125%.

I guess the thing I like about TG is that their upgade availability is not too bad and can be confirmed at time of reservation. A quick look with KVS/ANA Tool for the US and BKK routes looks like SK doesn't have too many upgrade seats available.

Can anybody just tell me how the basic miles for other *A flights are calculated? Ie, SYD-SFO with UA? How many miles would this earn. Is it done on the miles flown?

Cheers,
AB