If you have to be some place on time, don't use them.  I called at 2pm for a 4:15 taxi to arrive.  At 4:25 they were calling me saying he was right around the corner, and gave me his location.  Estrella called a couple more times to \"verify my address\".  At 4:35 I called them and cancelled the cab and got a ride from my neighbor.  As we pulled out of my neighborhood, we PASSED the cab. He had taken a street that he thought was going to be a through street and got himself lost. This is a TAXI service, they should know how to get around the valley!!  Don't these people use GPS, or MAPS at least?!?!?!?  End of story, I was still late for my class that I paid 250.00 bucks for. I was not allowed in, and the money is non refundable.  So thanks Estrella wasting my time and costing me money.  WORST TAXI SERVICE EVER.