Quality wise, I've found wi-tribe to be the best to date, after using Wateen and PTCL and Qubee.
Wateen was normal, long annoying processes, and sometimes downtimes as well which always came at times I badly needed internet.
PTCL was hell.
Qubee, customer service excellent till installation, after getting it, noone cares.
Wi-Tribe has been consistent to date, and have never ONCE not responded or fixed my problem.
They also give free gifts from time to time, such as extra downloads etc.
Customer satisfaction for me has been the highest with Wi-Tribe.