Rollei claim that the emulsion of CR200 is the same as RSX II 200, just on a different base.
I've shot a few rolls of CR200 and found myself liking the colour rendition---I'd say it skews a little warm, but basically "honest", so that it looks like a natural scene in slightly warm lighting, not like a "warmified" image, if you see what I mean. Whites are white. But it is *really* grainy; to my eye, it's grainy enough to make 35mm a really limiting format.
At the moment I've switched to Provia because of the grain issue, but if Rollei came out with a similar version of RSX II 50, I'd be all over it like flies on a thing that attracts a lot of flies.