Priceline Rental

I am going to Vegas in two weeks (for two weeks). Right now Priceline has the best car rental price (over $100.00 cheaper). I have never used them, and my wife is apprehensive about using a third party. Please offer your pros and cons about Priceline.
Thanks

Priceline will deliver and stand behind what you purchase from it. But be sure you understand what you are buying.

The only concern I would have is that you'll likely need to spend a little time with the rental company's counter agent.