Called them and scheduled a pick up at downtown phoenix at 2:50pm.  I stressed that they need to be on time because I need to make it to the airport on time.  The driver arrived 8 minutes early and told me he'll wait and I can just come out at 2:50pm.  Very very courteous guy.  The ride to the airport was smooth and it cost wayyy cheaper than SkyHarbor cab.  Very good experience, will use their service again if I\"m in Phoenix.