The Picture Gallery lets you link an unlimited number of pictures and sounds to your family members. All common formats are supported. All kinds of manipulation can be done with the photos. The most powerful feature of Legacy seems to be it's File Merge capability. No longer must the user accept the data from either one or the other record when merging records.
Legacy allows the user to pick data from both lists, then do the merge.
It is definitely the best merge program that I have ever seen to date. The program produces all kinds of reports, including my favorite, the Register Format report. One can pick their own fonts for reports and even add pictures. A date calculator is included as well as a calendar of the current month and year. Legacy also has complete LDS support for submissions to TempleReady.