So far, I've been pretty disappointed with Grado's build quality. My first RS-1 was very sloppily assembled - extra glue around the earcups, handwritten numbers on the earcups, the little wooden discs on the outside of the earcups were not properly centered, and the leather band was scratched. All this on $700 headphones. See pictures
here.
My replacement pair (one month later) is even worse. The black cylinders that contain the speakers aren't flush with the wooden earcups. In addition to the extra glue, there's some missing in a few spots. I've given up on finding a decently assembled pair. Sound, on the other hand, is awesome.
Some people may say I'm nitpicking, but no one ever thinks "resale value". What happens when/if Grado gets their act together and actually starts putting out properly assembled phones? This drives down the resale value of my sloppy phones. I don't plan on ever selling them, but it could happen.
Anyways, enough about that. I also own an SR-80. On my first pair, one of the earcups would not swivel at all, because one of the holes that held it in place was drilled too high. My replacement pair is properly assembled and sounds beautiful.
So.. Build quality? What build quality? Grado is seriously lacking in their QA dept, if they even have one. If ordering your headphones online, be prepared to spend additional money on possible returns/exchanges due to build defects.
My Senn HD650, on the other hand, is perfect in every way on the first order.