Agreed with everything said. Though I'd give them a 4/5 in build. The hinge is a very basic hinge, and I can see it loosening overtime and possibly coming apart with any kind of force or wear.
Also the shape of the headband irks me... I mean it is flexible enough to be fine, but it just looks weird.
The hinge is a very solid metal, not sure what kind, but extremely durable imo. I am extremely hard on headphones and if there are any durability issues, I'll find them. Cabling is very solid as well. I've gotten a shortage in the cabling of every pair of V-Modas I've ever owned (V-80, M 80, LP, LP2) except the M-100's, but they've only gotten light usage so far.
I've tossed the Monitors around many times and fallen asleep listening to them a few times. They're just as solid as the day I opened the box. I don't like the shape of the headband either, but they feel firm and new every time I put them on and I think the headband plays a large part in that.