for your money. An employee told me that the best time to go is just before Sunset, he swore you could see ghosts floating around ChicagoHedge (we didn't call it that then). Never made the effort to do that.
As a native Chicagoan, I've been to the Signature Room exactly two times that I can remember. Once because a friend wanted to have a birthday drink there. another time was for a date.
both were F-ing lame.
Most Chicagoans only do stuff like this when they have friends from out of town visiting. Oh, and the Sears/Willis Tower has or had a similar room. We ended up there one New Year's Eve and it was also...lame.