I have generally had good experiences with clean air cab- on time, easy to book... I also like that the fleet is consistent (Prius, not random personal cars). But my cab this morning wreaked so badly of cigarettes, I could literally smell it as I was approaching the cab. Now I smell of cigarettes as I am about to get on my plane. Feels a bit ironic- "keeping the air clean while suffocating its passengers with the smell of cigarettes."