Our guide was very knowledgeable and helped us follow the history of religious painting. I strongly recommend having a guide in this immense museum. I only wish someone had noted that the new, huge bottom floor of exhibits (in air conditioning) was a long walk to the exit.
This helped orient our 6 day trip to Florence. We hopped on many times. One of the better parts was the trip to Fiosole. The Archaeological Museum should not be missed, in addition to the trip being a pleasant escape to the country from Florence.