Worth the money. I wish we could've stayed to play the game but we had a 1 year old and 3 year old and they weren't as entertained as we were. I'm guessing it would take about 3 hours to finish.
Basically you buy the wand and access to the quests, then play a series of mini quests over 4 floors.
Pros: interesting, logic puzzles and riddles, waving your wand at stuff it fun!
Cons: a bit complicated for little kids, had to go up and down the stairs a lot (plenty of exercise)