only tried DMZ.my

plus point:
1. day-credit based subscription (combined cheapest of all imo)
2. ultra-fast payment approval (they approve u immediately upon sending them proof, then they proceed to check the proof u provided, damn nice)
3. great pings most of the time

negative:
occasional spikes in BG n 5-man dungeons. nothing serious.

quite happy with them now but may try other more expensive options like WTFast or Lowerping in the future...