I went to 101 in Philly with 200 dollar seats and 111 in Newark with 400 dollar seats. At 111 we were center ring 18 rows up with a perfect view of the cage. At 101 we were still probably 18 rows up, but were in a corner of the arena so the view wasn't as good.
Both times were a blast, and I'd definitely recommend going to an event if you can. We plan on going to Boston for 118 and will probably spring for the 400 dollar seats again, although the GF is talking about 600