I have a Panasonic AG-CVF15G on each 2700 and an Alphatron on my C300. They will spoil you in a hurry. I had to shoot for two days last week with my tape VariCam with it's B&W VF and I missed my 2700 badly(for two reasons). I've heard people say that you can focus easier with a B&W CRT than a color LCD VF, I would say that if you have a quality color VF, it's not an issue. Sometimes I do wish there was a physical toggle switch for B&W on the Panny's, though, but otherwise I love them.
Bottom line, I love shooting with a color VF and I wouldn't wanna go back to not having one.