I was traveling from Phoenix to Tucson without a car. My options were paying $200 to be at the airport 1.5 hours early and only to be on the plane for not even an hour and then still have to figure out how to get to my hotel, or take the Arizona Shuttle, which gets me to Tucson in under 2 hours including wait time and home drop-off for $65.
Check-in was a breeze and we left for Tucson about 10 minutes behind schedule. Not bad at all. I think there's a maximum of 10 passengers per van, but there were only 7 on my trip, so the van didn't feel crowded at all. It as in the middle of the afternoon, so there was no traffic and we arrived in Tucson quickly and safely. I got off at one of the shuttle drop-off locations and within minutes a separate van came to take me to my hotel as had previously arranged.
Everything was smooth from my booking to arrival at my final destination. It was a lifesaver for someone without a car.