We've had a little trundle out in the wife's GLC today and they are very comfortable I'm pleased to say. Acres of legroom for me (6'2") and plenty of adjustment for her to reach the pedals (5'). Very supportive, pleasantly padded and the factory leather has a luxurious feel to it too. They are definitely more comfortable than the ones in my 2013 M Class (which are comfortable). The heaters are very effective and had me on the rather toastie side in no time !How do the seats feel?