We had a few hours layover in Toronto and actually, having arrived so early in the city, we were able to get to CN tower as soon as it opened. there virtually no lines and it was easy to enjoy the city view and snap pictures as there were few people there. The visit itself is somewhat short.. we were there for maybe a 1h-1h30... by the time we left, around 11am, lines were long and we were glad we did not have to wait just as long in line as to visit it. Was it worthy it? Yes, we enjoyed it. Is it a can't miss it? Not sure.