I have been wanting to read this book ever since it was released. The hard part of starting A Discovery of Witches was not to get my expectations too high (sometimes high expectations aren't always a good idea). I thought it started a little slow, but it didn't take long for it to grab me and I was done in about 5 days.
How to say more without spoiling anything? I will try. I felt in some ways it is an adult version of Twilight (though 1000% times better writing and storyline - not a big Twilight fan here). There is the history that I love (hard to pinpoint a time period, that would be impossible - Matthew is really old). Romance - but not done in a mushy, overly cutie kinda way. Adventure and suspense throughout the book.
My only negative comment is that they is no release date for the sequel (yes there is a sequel)