We just had a party there with about 14 people from ages 10-60. It was a blast, and the staff were great and helped a lot. They powered down the guns for us a little so that the younger kids did not get too much sting. The fields were fun, and it was very hot that day and after a game your first instinct is to take off the mask, and the staff were on us to be safe first and kept a vigilant watch on us rookies.
The kids, and adults had a blast in the woods, and fields and the nice shaded area with the benches provide us with a nice area to finish the birthday party out.
Any parent on the fence about letting their kids do this should really not worry. In fact they should join the kids in this experience. You can really see them want to work together to take the field or castle or what ever. Glenn and the crew was friendly and tolerant of my rookie party group. I am not sure who had more fun, my wife or my son!