I've been told that the older (black face post 2000) Fender Bassman 400 and the newer silver face "Pro" models are exactly the same, except for the carpeting and color of the face. While other people tell me that they're entirely different animals. Still others tell me that the newer ones are slightly technically upgraded versions of the black face ones that (ready for this?) some people say are better and others say are worse. Can anyone give me the straight poop on the differences, if any, between the black face and silver face models?