Country Club Paintball in IL, no comparison. It's an indoor speedball field, this is outdoors with buildings and wooden bunkers.
I like this place quite a lot. My favortie part is the close quarters battles in the random buildings. Running down hallways, turning into rooms full of the opposing team, so much fun. The embassy games are the best, and the refs are open to suggestions on different games. I've played capture the flag, steal the other family's daughters (with a plastic keg), kill Steve Bartman, and elimination. If speedball is your thing, they do that as well, but it can get muddy if it's rained lately.
Be prepared to get dirty, even muddy, and wear hiking boots, as much of the ground is sketchy and full ankle-twisters.
Granted, my experience with other fields is still limited, but I'd imagine that this place ranks right up there as one of the best around. Some of the guys that work there are grouchy, but it's okay. I'd be grouchy too after dealing with some of the kids that show up there.
I give it a 9, because it's GREAT, but not perfect. I'd give it a ten if they had more elaborate bunkers, or maybe a nice sturdy tower to climb. Some sand inside the Octagon would be nice too. I've slipped in the mud there more times than I can remember.