I used Wingz to and from AUS airport recently because of no more Uber/Lyft in Austin. I reserved the car 3 hrs in advance, after boarding my flight to AUS but before leaving gate. Got a confirmation right away. Very nice driver Jeff in White Prius.
I reserved Wingz the night before return to the airport and requested Jeff again if he was available. He was and arrived right on time.
The 2 Hr advance reservation for airport pickup/dropoff was not a problem for me but not as freeform as Uber/Lyft. The 1 hour advance reservation for in town rides would be a barrier to use.
I was very satisfied and the ride cost less than others who attended the same meeting paid for a Taxi or the ride service obtained through the hotel.