just tried it today but you cant say exactly tried it because i saw the meter and it said O and that meant outside doha and i asked the driver that it should be on I ie inside ....so he started shouted at me that this is new service and i am private driver not karwa and started using abusive language i asked him politely to drop me to nearest place so i can take karwa.still he kept on shouting then he started bargaining but i was in no mood so finally i got dropped off.
The biggest mistake i did was i did not note the number of taxi i should so that it can be reported.

i think these kind of activities should be reported and discouraged
i am not supporting any company for sure