I am always quite paranoid about getting a cab to the airport after an episode of 30-minute delay (from a cab company I will not name here, but will never utilize its service again).
I decided to try my luck with VIP. I downloaded the App TaxiMagic, called VIP Taxi multiple times to make sure, and prayed a little before I went to bed.
Then, my cab arrived at 3:40 AM, 5 minutes earlier than scheduled. Driver was courteous and the car was clean. Needless to say, I was very happy with its punctuality!