Saw it last weekend and was underwhelmed. Great concept but poor execution. I was disapppointed b/c it really could be so much more than it is. It is worth seeing but not waiting any length of time for. It doesn't help that Shrek 4-D, which recently opened at Universal Studios just blows it out of the water by comparison.
However, given the target audience of its Fantasyland location, it may be much better when seen through the eyes of a 4-year old.