Must do!
The visit is well organised with very minimal waiting time at the elevators.
I visited at "golden hour", but I noticed lots of people from earlier slots stayed behind and took up a lot of space in front of the windows. They clearly had some trouble getting people to leave so that new people could also have a look.
Even without Fuji the view from both decks is amazing.
Great Views Of The City
The Sky Tree was a nice experience, we booked it to experience day turning to night and it was lovely to watch from this high viewpoint. The feature is modern and provides great views of the city. There were however a lot of peopl3, but still was a good experience.