I read a lot of reviews of this book on blogs that I follow, and decided I'd really like to give it a try. Sometimes e-mail type books stress me out because if they are written in certain ways I have a lot of trouble following them (especially if they jump from person to person very quickly). 
 I enjoyed how the e-mails didn't always say exactly what was going on, and the reader is left to pick up pieces here and there to get the general idea... so, to me, it seemed more true to the e-mail format than some others in this same format that I've read. I laughed out loud a few times (despite odd looks from my fiance), and even went back to read a few lines because they were so funny to me. I haven't read a funny book in a few weeks so it was great to lighten up. 
 Along with laughing, I had some intense emotions during the last half of the book because of some of the events that transpired. I ended up reading most of that half in one night because I was SO MAD at some of the characters that I couldn't bare to sleep before knowing what kind of justice they would be served (or not served, as the case may be). 
 Everyone else has commented on this too... but the book really is very large. It only took a couple hours to read but it's a hefty book, a couple inches thick... don't let it intimidate you! I'm hoping the sequel (which Holly promises on the last page of the book) is just as big - it's one I'm going to want to read soon after it comes out!