Take a cab instead! I pre-booked a ride with these guys on-line and payed $18 in advance for the so-called express service. When I arrived at the kerb at LAS, there was no shuttle waiting, and I was told it would be there in 20 or 30 minutes. So much for fast and efficient! Rather than waiting in the heat, I decided to treat my $18 pre-payment as a loss, and jumped in a cab. There was no line for cabs, and I was at my hotel in 15 minutes for $25.