Pretty much ditto the other reviews. I booked through Costcorental.com at a great rate.
Rode the shuttle to the facility (had to wait about 10 minutes at McCarran but it was a busy morning.
Did the online "skip the counter" checkin before the trip so all I had to do was go directly to the garage to my class of car (full size). Choices were reasonable for the class. Mostly Hyundai Sonatas, Nissan Altimas and one Toyota Camry. Picked one, loaded baggage and headed to the gate. 5 minutes and we were out. Exactly the way it should be to rent a car. Highly recommend!