I got this book after about seven months of piano lessons, using Alfred's Basic Adult Piano Course. A few of the songs are pretty simple, yet still complicated enough to be interesting to the listener. There are some doozies as well, to give you something to aspire to :)
All the arrangements are competent, and some are truly awesome, especially O Holy Night. All in all a great book to have for a family Christmas gathering.
I certainly recommend it if you've finished the Alfred's First Year adult book.