Absolutely top notch. I've rented three times from Don and James, and they always show the same unmatched level of enthusiasm and customer care.
The prices are the best you will find, and you can take the cars anywhere. There is a great Red Rock Canyon "scenic drive" that is exactly 50 miles round trip from the rental location, so fits perfectly within the 4-hour rental mileage limit.
Highly recommend Vegas Luxury Rides if you are looking for a splurge at a decent price. I'll also reiterate another review that stated that there are no hidden fees - you pay exactly the prepaid amount, unless you go over your miles or don't bring it back with a full tank.