After reading this thread, I was determined to try getting up there if we could find it on our trip last October. Doors were not locked, and as it was starting to rain, it seemed like destiny to try it. It was no problem getting up there- I just wish we were invited to a party or something up there- very cool!
Although the other people in my party were nervous about being there, it was no problem and will be a pretty cool memory to have. Thanks to OU!