I don't know whether its a real world rampant problem or not, but it's a dumb idea from a theoretical POV with no advantage over the standard design. That's the reason I don't like it. The main problem is is that because the bearings have a shallow contact angle ( typically 45º ), any loosness in the headset will translate instantly to headtube damage. The design also has a propensity to rock as the bearings are not press fit into the headtube, which is also asking for problems - Not exactly what you want from an expensive road frame.

The only advantage the design has is for Aluminium bikes with large downtubes, as the current head tube diameter is basically too small for any downtube over 35-38mm.

Anyone who doubts Chris Kings' engineering knowledge and dismisses it as 'marketing drivel' needs to have their head checked.