I stand corrected @ the Shure SRH-940 then :(
It LOOKS well built IMO from what I've seen of it. I was unaware of the cracking issue.
Lose that comical logo and it'd look decent, best though? I'd have to disagree.
Um... the HD800 is plastic too. The top of the headband is pretty much the only metal part of the headphones save for the meshes.
However, just because something is plastic-tasitc doesn't mean it's automatically bad. The HD800 felt incredibly solid and well put-together when I tried it out at a meet.
Though, the silver paint was quite disappointing. You'd think Sennheiser would give a $1500 headphone a proper finish, or at least one that didn't scratch off at the mere contact of a fingernail...
Bear in mind that HD700 is still a grand a pop, no matter how one put it, it sure doesn't feel like one. However, it's very very comfortable to wear.
Is it as bad or worse than the M50's build? Most people claim its a tank but I for one think the M50 feels way too loose and rickety.