I used priceline for the first time on my vacation. My wife and I booked a round trip back east and were only looking at direct flights and ones with 1 hop. We paid for the tickets and chose seats next to each-other so we could sleep and share snacks, watch the same movie etc.
NONE OF THIS HAPPENED! They screwed up our entire trip. I called the airline and I was told "They are a marketing partner and their technology is not good enough to pass the information to us correctly, so we see this a lot"! They told us, go direct next time. I am disputing the charges currently. Their customer service hung up on me twice.