The side grandstands may be the last place you think to sit for a concert at FirstMerit Pavilion, but they do offer some clear advantages over floor seating.
First, the grandstands offer a guaranteed seat, which is not true on the floor. For some shows, floor seating is actually floor standing.
Second, the elevation of the grandstands provides a better view of the stage than the back rows of the floor. And while the angle to the stage isn't ideal from the extreme sides, the views of the video screens next to the stage are good.