"Worth it" depends on the person looking to buy and redeem miles.
Sure, you can get exceptional business class flights on EVA, Asiana, or even United.
However, you will need to be flexible with your trip dates (because award space availability may not fit your plans), and you will of course not earn any miles (for status) from award tickets.
Since you are based in HKG, you could look at getting business class tickets from CAN on one of the Chinese carriers, if price is your main concern.
Lastly, Lifemiles is a nasty beast that you should ecpect to fight with just to buy/use/refund/change tickets on. Be prepared emotionally!