I've been researching this mod for over a year now. So far, I've found one dealer/manufacturer in the UK who say they can provide fitment for my '02RS. I've also heard from some that the US made CF moto wheel has proven to be better than the UK made-- I think its more about the cosmetics and design look (BST) than anything.
Having said that, and aside from the money, I am aware from my sports car and bicycle racing days that lightened wheels and, for that matter, drive train components and any other unsprung parts or those with rotating mass, will always improve performance in several ways-- acceleration-yes, braking- yes, cornering-yes, in the case of cycles-flickability, etc.
Crazy though it may be, I've always enjoyed holding on to vehicles that I find comfortable in terms of fit and ergonomics, opting to continually upgrade their performance rather than just trading out every few years. I've done this with cars and bicycles and am now doing it with my RS. In its case I think its strong suit is its engine and drive train-- all the power I'll probably ever need, and very streetable as well. So, I'm not reluctant to keep improving its performance, comfort, utility, etc. The bike just suits me that well and I've not developed any lust for any other, as yet, and its been 7 years.
So, in general, if you're going to invest in performance improvements anyway, lightening components makes sense and can sometimes be more cost effective than trying to improve power. Doing this with a dedicated track bike makes more sense perhaps, but what the hell.
One must be careful with CF moto wheels though to be sure you can fit up all the components your wheels will need to interface properly with the rest of the bike-- rotors, axles spacers, cush drive, etc., etc. In addition, you might as well go with a 520 chain/sprocket kit while you're at it and keep in mind the reduced service life of those components. If you like to go to the track, then all this makes a little more sense than if you're essentially a road rider only.
In fact, the argument can easily be made that for a given amount of money spent, attending track days and improving your riding skills may make you and your bike faster than all the exotic gizmos ever would. Personally, I'm interested in some of each, but that's just what happens to float my boat. I guess I'm prepared to take all the ribbing that might accompany my riding around on a middle aged sport touring bike with a pair of hot wheels.
Perhaps those of us who are sufficiently interested could lobby for a group buy out of this forum-- the times are good for that since I've seen upgrade wheels selling lately for pretty good discounts due to the slow markets. And, a group buy could be ideal since many would be seeking wheels built specifically for our bikes which might be attractive to the fabricators as well.