I liked the REA for the last couple time they played NDSU there, when there was 7,000+ there it was a good environment. But I didn't care for the atmosphere the last time they played USD there, I think in 2010, there were only about 4,300 in attendance. It is just too big for my liking, especially when the lower bowl doesn't even fill up.
By contrast, once you get above 2,500 or so in the Sioux Center, the environment is excellent.
I agree about the larger risers in the Betty. If you doubled the size of them that would put capacity at about 4,000 which is just about perfect.