I was able to get around Blizzard's website not taking credit cards by using the mobile app to buy the DLC.

It looks OK so far. I like the stackable inventory pages, and entire Acts getting Terrorized.

There's a bit of power creep with some of the new items. A couple mid level items seem interesting too:

Jury is still out on the Warlock class. I think we'll need time to learn how to use it.