I used Expedia once, and never will again. When we went to WDW in 2009, I used them to book for our party of 7. Their site does not let you book a number that large. When I called Expedia to try and do it over the phone, they told me to go on their website and book a reservation for 3 and then a reservation for 4. I did that, but closer to our departure, got an email that one of our reservations had been changed, but the other had not. I called them to try and straighten it out, but they told me because I had bought non-exchangeable tickets, there was nothing they could do unless I paid a $150 change fee per ticket.
I called Delta, and they were able to straighten it out without a problem, and then linked the reservations so it wouldn't happen again. I understand Expedia was well within their rights in the fine print, but since I followed their instructions to make a larger reservation, a little help would have gone a long way.
Jen