I have returned mine to Apple in February, but bought them again in another store a month ago (20% cheaper). Like the sound very much, but they I feel the weight and my neck hurts after 1-2 hours when I have them over my head at the desk
(they also get a bit warm but that is okay)
I am not sure this will go away, really love to use them for the audio-quality, but this neck-pain is not comfortable at all... I am a fit athletic person, no issue with posture or so, but maybe I have them setup wrongly, have tried various positions but none of them is really 100% (the best is when I sit down in the Ikea Strandmon chair and my head lays on the chair itself...)