This gallery was the main reason we visited Florence on a day trip from Rome, although the whole town is lovely of course.
We pre booked tickets and once we understood the queuing system for the timed tickets, entrance was quite smooth (considering the volume of people).
The palace is beautiful and as with other museums in Italy, there are gorgeous art works on the ceiling as well as the walls. I particularly went to see the Botticellis, but there were lots of other fabulous art works. In the end my absolute favourite was the Artemisia Gentieschi painting of Judith beheading Holifernes. A violent scene but very impressive in real life.
There is a lovely terrace and cafe too with a view of the dome of the basilica.