A wealth of quality and rich content that can make D&D games more creative and fun with added steampunk goodness. It's very well put together and can add a lot of flavor to your campaigns, especially if they are set in Eberron or Ravnica. The crunch and fluff in this supplement go together very well - the new mechanics go hand in hand with the cool homebrew spells, subclasses, and some nifty magic items in this book. The writing is pretty good and you can tell that a lot of hard work has gone into the making of this handbook. The artwork and layout aren't too bad either.
This book has everything you need to start throwing together mechas of your own with plenty of readymade examples and gives you a ton of options for customization. Pretty great stuff!
[5 of 5 Stars!]