Absolutely terrible line. I can't believe they charge $6 a person, when a damn taxi cab costs $11 to the strip. We got into Vegas and waited in the fume-filled busing dock for 20 minutes, after finally going to the window and asking where our bus was. They lady said it would be there soon, so we waited for another 15 minutes. Sure, there were Gray Line buses that stopped a loaded up passengers multiple times in front of us, but refused to take anyone else on. There was even a bus waiting in the dock for his group to land from vegas; talk about inefficiency.
Finally our bus came, and holy damn was the driver unfriendly. He lost my tip. It took over 40 minutes to get to the strip, and finally to Monte Carlo. The driving was terrible, the bus smelled bad, and if you get carsick, this is not what you want to take.
Save yourself the pain, and just take a taxi. It's worth the extra $5.