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edit: just seen the fork isn't bolt thru :'(
And be prepared for flexing of the QR.. my front rotor rubs the moment i'm out of the saddle. I'm going to try the DT Swiss faux bolt thru axle and see if that's any better. Disclaimer: 6ft 4" and im 95KG so that may be a factor.
With that all said, buy one its honestly one of the best bikes I've owned and dare i say the cheapest! Bargainz.
As @edscoble says it is down to frame material, carbon vs alu.
I found this comparison article to be very informative (SuperSix EVO Hi-MOD vs. CAAD12)
https://cyclingtips.com/2017/01/cannondale-caad12-vs-supersix-evo-hi-mod-road-disc-bike-comparison-review/
I had been lusting after a SuperSix but after reading the above think my next bike/frame will be a CAAD12