I'm sure I wouldn't have went up if I wasn't with the kids. If you're not going to the restaurant, all that is up there is an observation deck. Views are spectacular but so were the views from the 18th floor of my hotel. One of my kids loved the glass floor you could stand on which probably made it all worth while.
I'd love to eat at sky 360, but at $45 for a family of 4, just the tower experience is 3 stars.