I'm running this now (the party's near the end of Chapter 2), and so far it's quite a bit of fun... if you're in the right mindset.
If you're looking for a wacky jaunt across the planes, merrily killing drow and demons, this will probably work for you. If you're looking for an adventure with plot & complexity, you'd best look elsewhere. I was looking for a pretty brainless adventure I could run once a month for some gaming-deprived out-of-town friends. My prep time is somewhat minimal, so this seemed like a good buy.
The format of the adventure actually is pretty easy to use. You get all the material for a single encounter on one page, or two facing pages, along with full stat blocks. That layout makes my job as DM pretty easy while I'm running the game. It's somewhat annoying while I'm *preparing* for the game, but once I got used to it, it worked.
I'd give it 5 stars for the material and for the presentation, but the stat blocks are awful. I'm not talking about the new stat block format - I *love* the new stat blocks (top section is pre-encounter, second is player's turn, third is monster's turn, fourth is detail, fifth is exposition), but the stat blocks are full of errors. I don't know that anyone really did proofreading on this book. (Two Examples: Ratatosk damage assumes small-size weapons while the creature's size is listed as Medium. Rule-Of-Three's dagger attacks don't include the magic bonus.)