A blast. Seriously the best way to cruise around Vegas. The people pointing out sites were a total riot and got the passengers engaged with ease. The hop-on hop-off feature gave us freedom to wander the city at our leisure. We opted for the 3 day pass which also came with freebie tickets to the CSI experience (it was good for the price!) and some other things that we didn't use.
The lady at the counter was cool enough to let me buy the passes on my phone (right in front of her) because it was a better price.
Totally recommend them.