Neil has tendonitis in his elbows and Alex is hitting the arthritis wall.
Couldn't tell by the way they played though. They really pulled out all the stops.
Oh, and the equipment. The walls of amps, the paisley guitars, the double necks... Home run.
Heres the full setlist:
http://www.setlist.fm/setlist/rush/2015/first-niagara-center-buffalo-ny-3c9d12b.html