My upcoming review will be on MH 628 (SIN-KL) and MH 605 (KL-SIN) on Economy Class. Both flights are on 737-800 (I used to remember MH used to have A330 going between KL and Singapore).
I have tried the 737-800 on Business Class, I shall try the Economy Class this time. The tickets were redeemed using my balance of JAL Mileage Bank miles which will expire in June 2016. The bad thing about JAL redemption is their distance redemption (and not to mention the awfully long wait on the telephone). The cost for SIN-KUL and SIN-KUL-SIN is the same (i.e. 15000 miles).
Non-flying miles earning for JAL in Singapore is extremely poor. None of the local credit cards are transfer partners with JAL.
I will also try to review the following lounges:
Jetquay Terminal Lounge
KLIA Plaza Premium Lounge (via Priority Pass Card)