I'm not the kind of guy who goes for the limo ride right off the bat. But we were only staying in Vegas for a weekend so we didn't really need to rent a car. And after paying about $40 for a ride in a cab that both looked and smelled like a hobo had lived in it for the past month, a taxi was out of the question.
Right from the start I was impressed by this operation. They "idiot-proof" it as much as possible by sending you a confirmation email 24 hours prior to your pickup. I called them because I had screwed up in one place on the online order form, and their phone staff person was extremely friendly and helpful.
Each of our drivers (both to and from the hotel) was extremely courteous and friendly as well. We got the Escalade and it was a very comfortable ride. In both cases I got a phone call when the driver had arrived (they were early both times). A first-rate experience all around.