Here is a comparison (that I could find) of the MAC schools' indoor facilities:
Akron - 155,000 SQF. $13 million (2004)
http://www.gozips.com/athletics/facilities/stile
Northern Illinois - 80,600 SQF. $9.5 million (2013)
http://www.niuhuskies.com/sports/hasf/sp...enter.html
Kent State - ????? SQF. $6.5 million (1990). Undergoing a $4.5 million expansion.
http://www.kent.edu/admissions/explore/v...&width=853
Any Kent fans know what the square-footage will be when the renovation will be done? I'm guessing the current facility is around 100,000 (couldn't find the number0 with a 12,500 addition (according to the Kent board).
Bowling Green - 127,000 SQF. $8.7 million (1993).
http://www.bgsu.edu/offices/sa/recwell/f...68553.html
Toledo - 90,400 SQF. $9 million (2011)
http://www.utrockets.com/ViewArticle.dbm...ID=3744401
Eastern Michigan - 86,000 SQF. $3.9 million (2010).
http://www.emueagles.com/sports/2010/4/2...spx?id=447
Western Michigan - 121,000 SQF. $25 million (2003)
http://www.wmubroncos.com/ViewArticle.db...LID=120528
Central Michigan - ???? SQF. ????? (1999)
https://www.cmich.edu/about/locations_ma...enter.aspx
I can't find square footage or cost.
Ball State - ????.
Does Ball State have an indoor facility?
Buffalo - ????
Does Buffalo have an indoor facility?
Ohio - 74,000 SQF. $12.5 million (2014).
http://woub.org/2011/10/10/indoor-facili...-athletics
Miami's has already been linked.
This is just a brief look at the different facilities in the MAC.
My personal favorites are Akron (homer, but IMO, still one of the best in the country) and Western Michigan's (architecturally, it looks awesome ... and obviously was expensive). Both are about the same age. I'm guessing some of the bells and whistles the WMU facility have are some that Akron has in its seperate, but adjacent rec center ... which opened a couple years before Stiles.
I have a soft spot for Kent's, since when I was in high school in the 90s, it was "THE" indoor facility to run in the Cleveland area (it was Kent 300 meters, or Baldwin Wallace, 200 meters). Me and some buddies would get together and go down there for the open meets on weekends. ... It almost got me to go to Kent ... almost. I didn't know about the expansion. Good for KSU supporters.
Overall, nice facilities for the league. EMU's football one is horrible, but I believe EMU has another indoor center for other sports, so that explains it.