Don't use them unless you want to have $0 available credit on your card, no flight booked, and spend hours on the phone getting transferred so you have to explain your story all over again...only to have everyone tell you that they can't help you even though it's the fault of their effed up website.
At this point I am willing to pay $60 more just to NOT use them. Of course, wait, I can't book with someone else because of Delta's stupid-@$$ pending charges.
I am never EVER going to attempt booking with them again. This has been such a distasteful experience.