Whenever I leave town, this is my cab company of choice. They're very responsive and the driver usually calls thirty minutes ahead before arrival time to let you know they're on their way.
Admittedly, I did experience a snafu when some jerks in my apartment complex lied and took my cab. (It was a rare incident when the driver did not call ahead of time.) Left without a ride, the nice person who picked up the call ended up giving me a complimentary ride to the airport. This was a kind and appropriate gesture, considering it really wasn't the driver's fault. (Yes, I did make my flight... because I prepare for stuff like this.)
Note: If you're on a super early morning flight, they give you coffee and a donut. Yay morning carbs:)