We went to KL several years ago and I did some research into that wave pool, it was rarely turned on and when it was, it was for the kiddies. It may have changed but I don't think they crank it up very often.
We drove across Malaysia and stayed in Cherating Beach and got a few waves. Takes about 4+ hours drive but is a pretty cool spot, waves are fun but can be inconsistent, even in season. There is a Club Med in Cherating which makes it an easier sell to the wife!