I have been trying out YES 4G at Rawang area. Full bar service and speed test can go up to 15Mbps download.

Play Wow without tunneling can get 240ms - 500ms ish range, disconnect and reconnect will help. Been raiding 10man and no spike lag with addon and lots of spell cast (I figure a better Video card will help).. considered stable.

Usage wise.. raiding for 3.5 - 4 hours with Vent on will come up to about
100 - 120Mb data volume. Without Vent and just play 5man and questing for about 3-4 hours will result in 50 - 60Mb of data volume.

RM68 value pack for 3.5GB data quota is good for me already since I only do 3 days raid and others time I am using 1Mbps Tmnut line + tunneling for questing and 5man.

Hope it helps.