I haven't read to the end, just got through the first page. In theory, 45lbs savings from the curb weight (no matter where it is) will yield better perfomance in every way. For those who say "I'll save weight on exhaust, rims and brakes" .... well, you can additionally save that weight on top of the CF roof. Remember it all adds up.
There shouldn't even be an argument whether or not CF has benefits in terms of performance. I mean, we're not little kids anymore. Less weight = better performance, period.
Esthetically, knock yourselves out. Performance wise its not even a question - however minute it might be, its still there.