610 g is not nothing for the cervical vertebrae for prolonged listening...No one felt this excess weight?
I only wore them briefly at canjam, so take this with a grain of salt, but I did think they were very comfortable. In my opinion "heavy" headphones are no issue as long as the weight is well distributed, and I think this will be one of those. I might be in the minority here, but I actually prefer the heavier headphones. The light ones feel too fragile, and like they might just come off my head if I move too suddenly. Maybe this is why they are often so clampy.I share this concern with you.