I have only played at Signal 20's permanent field once, but it was great. It is just one field, which is OK. RPC only has one good one. Its pretty good sized and the owner changes its layout once in a while. The owner is a really nice guy, very help full, and knowledgeable. His team ( Colorado Surge.) reffed for the tournament that I played at, they are all nice guys and know their paintball.
It is a new field and is just getting the bugs worked out. But I would rather play there than at RPC ( Rockymountain Paintball Coliseum ) just for the fact that the owner is nicer. The bunkers are just cylinders laid on end or standing up, not as interesting as an X-Ball field, but stil fun.
I don't have any real negative things to say. Maybe the usually, needs another field? But other than that it is great for new players or experienced ones.
I did give it a 9 because there is always room for improvement.