Yes I bought it and yes it is fun. I haven't though yet had a chance to try out adventure mode because we are still poking our way through the new act. From what I hear, it's the new cool thing to do and it appears to be really the only thing that anyone else on my friends list other than Dave and myself ever does in the game.
The new enchanting ability is probably one of my favorite additions to the game. I can't tell you how any drops I have received were literally off by one stat or buffed the wrong ability. Enchanting is kind of like WoW gear reforging with an RNG element. Don't like that one shit stat on that legendary drop? Well, you can now reroll any one property on any piece of gear for crating material costs. You have the ability to preview what the possible outcomes are before spending the materials. After you enchant, two random picks will be selected and you will have the option of either keeping the original stat or selecting one of the two.
We have been progressively lowering the difficulty down from torment III to master as we have progressed through Act V and have subsequently discovered that we are way undergeared for expansion pack torment difficulties. Well that and, we kind of what just casually make our way through the new content at least once without being too worried about getting reamed by an elite mob. We'll worry about the finer art of gear farming and what not at a later point in time.