I have the Dungeon Master's Kit, and have just finished my first reading of the DMB it includes. I think it's a good book, though some things are missing, rituals being the one I recall now (besides small references. I'd have liked to know at least some generalities about rituals, if those belong in DM books).
I have read many good things about the DMG 2, and its advice for creating adventures. Is there a significant difference, or has most of that good content been included in the Essentials DM Book?
EDIT I'd really like a proper comparison between the two books, not a "DMG2 is an awesome book". The question is not exactly about how great the DMG2 is, but about its content compared to the DM Book.