Went through the centre a week ago. There will be very few rear ends that won't fit in the seats, although the depth (length) of the seats seemed short. We found shoulder width to be the problem. There's a decent amount of bum room but two bigger guys sitting beside each other had shoulders touching/pressing against each other in the General Admission seating (20"). Shoulders still touched in the Club Seats (22") but it wasn't bad at all.
33" between seat and seat in front was nice. When you stand up, there's ample room for people to pass in front.
Investors Group Field seats were far and above more roomy and comfortable which is unfortunate, but I guess it is what it is.
I snapped a few pictures for those out of town folks.