Everything I loved about the first ruleset has been improved with this new edition. The DM section takes up about 3/4 of the book and is chock full of inspiration, tables to roll on for fun twists, and excellent suggestions for running the game.
My top three favorite new things: Advantage and Disadvantage for more than just attack rolls, fluctuating prices when shopping, and simplified spells and spell slots for magic users.
For six bucks you are getting a real deal. Buy. This. Book.
[5 of 5 Stars!]