Priceline's name your own price and hotwire's websites are both perfectly fine assuming you don't need to change anything (as previous poster said). The problems, if any, will be just from whichever company you happen to get, and have nothing to do with who you booked it through. Our last trip was booked with priceline, and we got Budget rentals. In over 75 trips to Las Vegas and using nearly every rental car company on the planet, this was our worst rental experience ever. (And the car itself was just fine.) It took FOREVER to get the car, and there were lots of agents working. I swear they took at least a half hour with each customer. Not sure why they were taking so long other than trying to sell the insurance. I suspect they didn't have the vehicles available to let us go. It took another half hour to get out of the lot; only one agent manning the gate, and he was obviously not having a good day. Finally, returning the car, it took over 15 minutes to get someone to give us our receipt. Standing there in 100 plus degrees waiting was not pleasant. I fired off a complaint to the national office and received a whopping $25 credit for my next rental, but since you can't use that on Priceline or Hotwire, it's not likely to be ever used.