I was happy with my Clean Air Cab experience... I have had to rely on cabs to get me to and from work and for running errands, and I also have always used cabs to get to and from home on nights out at the bar with friends.
I've had questionable experiences with drivers from other companies, especially Sunrise Cab, where the taxi driver made crude racist remarks and didn't even have a working GPS.
Anyway, I called Clean Air Cab Saturday night to get a ride to Scottsdale to meet some friends. The driver called right away and said he would be there in 10 minutes, he was here in proabably like, 8 minutes. He wasn't creepy (that's a big plus to a solo young girl in a cab), and the rate was reasonable. The cars smelled new, too. Definitely my go-to cab service here in the valley from now on!