I've been a number of times. It's an awesome experience and you really begin to understand how Kubrick worked on his films. You could be at the archive for a number of hours and all you could've looked at are some pictures taken in pre-production stages of hat choices for A Clockwork Orange. It's immense the amount of boxes in the archive, so if you are only getting the chance to go once, make sure you know what you are asking for. And enjoy!