Highlights are Michelangelo's David and the unfinished Slaves. The David was recently cleaned in a controversial project. No photography is allowed inside. Wait times can be under one hour in the off-season. It is possible to reserve at the academia in advance and save yourself the long line. If you're only interested in see David and Rape of the Sabines and are short on cash you can see replicas in Palazzo Vecchio where you can also take pictures. Note that while restoring or repairing art, the gallery often showcases the replicas (you can tell because the toenail is intact for David, for example).