Honestly, one of the best Alice in Wonderland adaptations I have ever read. In fact, off the top of my head, I cannot think of a single other adaptation that has topped it thus far.
It's also, without a doubt, the most confusing and convoluted manga I have ever read. In a good way.
Now, I am sure many of you have read a manga in which the mangaka (a) does not know how to plan out stories or (b) does not know how to execute said planned-out story, resulting in a confusing piece of work in which you have no idea what's going on.
Are You Alice? is definitely not one of those stories. This is a manga that knows precisely what it's doing, and all confusion (and, boy, is there a lot of confusion) is completely intentional. Each chapter delivers answers, certainly, but these answers are followed by more questions and more confusion, to the point that I'm not even sure I can trust the answers that were previously given! And that mystery is truly where Are You Alice? shines. It knows how to give just the right amount of info to keep the reader intrigued, all the while not giving too much away, and all the while hinting that nothing is really as it seems. It helps that the art is absolutely amazing too.
The only concern I have right now is that the ending won't meet up to the expectations brought on by the story. But, with such a well-thought out story like this, it doesn't seem likely that the ending will be very disappointing. (And, at five volumes, the end does not even seem to be in sight, so that's a really far away concern, regardless.)
So, to sum up, like everyone else has mentioned, Are You Alice? is a manga with a very deep, involved, and complex plot. It's confusing, it's crazy, and it's wonderful. Read it. You won't regret it.
edit: Now that I've finished the series, I'm left with some mixed feelings. This is definitely an instance of the mystery being more interesting than the ultimate reveal. Regardless, the ending was fitting, and it gave me heartwarming feelings considering how long I've been reading this. It's not a perfect series, by any means, though I enjoyed how it followed its own internal logic until the end.
I would tentatively recommend this one, with caveats.