I've really enjoyed the individual entries in this series so far and highly recommend any of them if you're planning to take your game out into the planes. If you haven't already got these separately you should definitely consider picking up this bundle. It's a really exhaustive treatise on the inner planes that contains enough information and resources for you to run an entire planes-based campaign using this book alone. The monsters and adventure hooks presented are great and are supported brilliantly by extensive, well-written lore, and the new backgrounds are a nice addition to the product.
-Chris, Loot The Room
[5 of 5 Stars!]