I try to play every weekend at OXCC, usually Sunday unless other plans push me to Saturday.
I have seen between 6 and 90+ people there. The average is probably 20-30. Most days there is a group of 10-20 renters and 5-10 geared players (both mil-sim and power rangers).
The refs are top notch and will vary the games any way you want.
Walk on woodsball is a LOT of fun at OXCC!
My spool experience causes a little discrimination I suppose.
Ion: takes a half hour to do easy maintenance and there is a 50% chance it will leak once reassembled.
NT: requires at least a four year degree in metallurgy, physics, meteorology and dark magic to get it to operate.