My cape Gopher can be pretty loud, but not scare the neighbors loud! As someone else said, the tail rattling is worse. Also, they don't hiss all the time. My CB only does it once every two or three months, when my hubby comes too close to her! My wild-caught bulls normally settle down in a few days.
I also had trouble finding good care sheets, but I think that is because it is so easy to figure it out! I've been to California, so I knew what temps to keep my Cape at, and the other pits I've kept were pretty easy, too. Just get avarage temps from that area on the net!