It was interesting, lavish, gaudy, historic and decadent. Went in early May so it wasn't peak…read moretourist season, and still fairly busy. Official tickets for the week was sold out, however was able to book with a tour company that wasn't that much more than regular prices. That actually seemed to have worked out better than I planned as it allowed you to skip the line.
Plan for a couple of hours, and don't forget the armory on your way out.