I'm using Combo 60 in penang so far download & browsing speed ok. Download between 30~40Kbps . Speedtest download = 380~450kbps
Most important thing I learned is noisy lines causes slowdown, disconnection etc. SNR margin should be above 30db. (mine 39db) .
I called telekoms to fix noisy line 3x (contact issues on phone exchange)
if SNR is low, i tested with 1MB account also very slow . FYI - I watched a lot of Euro 08 matches smoothly (no lag at all) for the last 1 month.. (using 1MB account)