Hass the system works fine with Mac. All info is available on Qtel site please go through it. I have cut -n - pasted the info you wanted below.

5. Will Mobile Broadband work when I am abroad?

Yes, in countries where Qtel has a HSDPA/3G data roaming agreement. However, while roaming you will be charged data roaming charges and consumption will not be deducted from your monthly Data Allowance.
Please click here for list of agreements and charges.