I saw Up last weekend and liked it well enough. It's a very entertaining show..the acting is very good and the message of the story is great. The show itself is really really predictable, though. And the end is slightly cheesy

But overall, it's worth the ticket price, especially if you can get them discounted.
One word of advice, though: Try to get seats close to the stage. Rachel Brosnahan (Maria) is very soft spoken, so it's hard to hear sometimes, especially when the dialogue overlaps. And she's HILARIOUS so you don't want to miss her lines!