This is a great place to take a kid - or a kid at heart.
It's a large store, so there are some amazing builds done by the staff, including an amazing dragon.
One of the complaints I have about Lego lately is that there are fewer and fewer (are there any left?) "generic" sets of blocks, where you build from your imagination. Everything today seems to be a specific project.
With that said, a Lego Deathstar is amazing. :)
I have never seen a Lego store like this one. This store is the largest Lego store I have seen. Also, it offers sculptures of 30 Rock and other NYC buildings made completely out of Legos! I loved the selection of Legos. I was a little disappointed to learn that there were no NYC-specific Legos at this location.
Amazing little museum/store of everything Lego, I wish it were a bit bigger but there's only so much Lego in the world! Still one of the biggest stores I've been to nonetheless. Worth a stop if you're already in Rockefeller Center!