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I've got a 2015 one and it's fantastic. Never had a creaky bottom bracket (always used a Praxis) and then when I switched to SISL2s used a WheelsMFG, also perfect. I think that crank cracking issue got addressed a while back, and as others have said Shimano cranks break too
I sometimes get a little frustrated at not being able to put wider tyres in the rear, but I have other bikes for wide tyre duties
I've never owned a Cannondale but was thinking of buying a 2015 supersix. However reading up I see lots of complaints about creaking bottom brackets and SISL2 cracks. I'm having serious doubts. Can't inspect bike.