Shea's Smith Theatre is a theatre that gives Buffalo visitors another angle on the place, especially if you have already covered the obvious landmarks. It is the kind of stop that works best when you are building a slower day around a neighbourhood, a park, or a cluster of nearby sights rather than racing through a checklist.
It is most worthwhile when you can pair the building with an actual performance, though the venue itself can still help you understand the city's cultural life. Look up the programme in advance, as schedules and language needs vary more than museum opening hours.