I finished it late (as in past 12:30 last night late). I'm seriously considering restarting the book and going through it at a more leisurely pace, now that I'm past the "OMG OMG what can happen now??!!" sort of thing. But at this moment, I like the book quite a lot. It's big and sprawling and complicated and messy and emotional, and Rowling has plenty of surprises -- good, bad, and horrible -- waiting inside it.
I just really liked this weekend in general: it was a unique moment, of so many of us devouring this book simultaneously. It's probably the closest we can come to having a story downloaded straight into all our minds, Matrix-style. (I have a feeling I have more to say about this, but my tired mind's not finding the thoughts and converting them into words. More thoughts later, likely...)
I'm also glad I saw the fifth Potter film right before getting the book; without giving too much away, Order of the Phoenix is especially important to the seventh book.
(Oh, and for all y'all who've finished it, check out cleolinda, who's been very wrapped up in observing Potterdammerung, and doing so with her usual wit and perspective. Spoilers definitely there, under cuts...)