It took some breaking in for me as they clamped pretty hard imo. Now they feel perfect.

Not a fan of either of the pro version's cables, though. Coiled one is pretty heavy and the other one is short as hell.

HD660S was more comfortable for me initially but Focal is better after a while. Where my ears would touch the padding in the middle with Sennheisers there is no such problem with Focals.