My family and I toured the Sears Tower Sky Deck yesterday. It was a great day to spend the morning, before taking a cab to the Wendella Chicago River & Architecture tour. Fortunately I read several reviews on tripadvisor that suggested paying a bit more and purchashing the Sky Deck FastPass online before going. I am beyond glad that we did as the lines are unbelievably long! And not just one line either. As other reviewers have noted, just when you make it through one line and they empty you into another room in which you think you are done...surprise, you're not...you're just in another room in another long line, starting the process all over again. We saw this as we passed all those lines by as we had prepurchased FastPasses. Whew!! We went about 1045 and while you still have to stand in the line outside the building, once through the door, the guides start calling out for patrons with "FastPasses." Ok, enough about the two hour lines and onto the Skydeck. It was great! Once up there, it is large enough so no matter how crowded it is, you will have ample room for photo shots and viewing. There are lines to stand out on the new suspended glass floors, but those move quickly and are only about 10 minutes long. Make sure you bring a camera...the outward and downward view from those is something you'll definitely want to capture on film! There is also lots of Chicago trivia on the walls so this trip is enjoyable and educational as well..for all ages i think!