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@iltmimi
I had Cosmic SLRs - the 50mm aluminium Exalith things for long enough to know that heavy, very stiff aluminium rims weighed down by an extra carbon section are the worst of many worlds. Took a lot of effort to spin up and very uncomfortable. I shouldn't have given in to the scaremongering about braking issues with carbon. Nobody tells you that good carbon wheels aren't just light, they're magical for ride comfort.
The SLRs always stayed true and didn't need any maintenance despite plenty of abuse and winter commuting. Didn't like the quality of the carbon section, the valve hole was too large so the valve made knocking sounds over bumps, and the hubs looked cheap and plasticky.