I have them on my truck, actually, I'm on my second set of Crane rockers. I bolt broke on mine after a year, so I replaced all of the rockers. No problem with the install, just follow the instructions if you have to shim them. The major pain on the install is the upper intake... you have to unbolt it and slide it off to the side to reach the passenger side. They are as quiet as the stockers and unless you have gone with a big cam, valve clearance is not a problem.
As far as performance, I didn't really see any increase, but others have.