Cape Cod Paintball, Boston Paintball, UMass Paintball Fields
All around a very good staging, the prices are reasonable, they are able to fill air to any pressure, they have food, bathrooms (granted, port-a-poties), enough variety of paintball at reasonable prices, or you can BYOP if you self-equip. Plus they have many theme days where the prices can be dropped to as little as $15. The owner is very knowledgeable, he was able to fix some parts of my Palmer Blazer, which normally people can't do. One problem I noticed in setup is the kids filling up CO2 were over pressurizing the bottles to the point of blow-outs.
As for the fields, it's large, somewhat divided into 5-6 fields, where you can easily have 2 40 person groups out there in separate 2 games and never run into each other. On the Big Games (which there will be 3 this year) the whole field is used can can easily hold ~400 people, plus they will be expanding into more area soon. There's plenty of cover in behind rocks, wall, trees, etc., not to many bunkers though. The two minor problems are the swamps, which can get deep at spots (saw on 12- year-old kid up to his chest in water) and the brush can be too thick at places.
For safety they are very stringent, which I like. They make sure all markers are chronoed before the games, and they occasionally have pocket chronos just in case people want to crank up the guns and fire hot on the field. They also are stringent on making sure players keep their masks on and barrel plugs/condoms on. I personally like that, I rather people get warnings, than losing an eye.
As for the players themselves, I've only seen a few jerks out on the field, who get in peoples faces. However; they are a vast minority, and it is clear that the owners don't tolerate it at all.
Overall, this is the best field I've played at in Massachusetts, while a few flaws here-and-there (as any field would) I highly recommend this to anyone who wants to have a good time.