I've been here before this visit but voluntarily. This time it was for an assignment.
That aside, I had a great time.
My assignment was in the Americas gallery. It was overwhelming to take in, perhaps because of the assignment at hand. I loved the variety and theme like displays. The quotes were amazing.
There is security everywhere. You have to leave all your worldly possessions at the front desk. They give you a numbered tag, you bring it back, you get your items. I hate doing that because I don't trust people with my things, but in the same manner, it was nice to not be bothered by my massive bag.
Whenever I go, exhibits are changing which is a pain because I want to see what is being prepared to be shown. I hate being held back from awesomeness.
It's definately not a place for kids though, so be warned.
And yes, while it is free, they are not shy in asking for donations or showing off the donation display begging for more money. So bring a few extra dollars when you come or you may get a few odd looks.