Go see it, it's probably one of the best Broadway shows. I love the production design and more importantly the story (a prequel to the Wizard of Oz). I only wish I thought of the story first. It's about the good and bad witches, but there is an interesting spin on who is the heroine.
My only caveat is to buy tickets that cost a little more. We sat in the balcony, so I can see the tape and markings of where the actresses/actors have to stand.