I got a pair of Q40's today courtesy of one of the bros here from Aus. Build quality is good but not great, the headband and hinges are solid but the cups feel a bit fragile to me.
In the very short time I listened to it (25 mins tops), the first thing I thought of was "man I need to replace these stock earpads" and after a few minutes the second thing that crossed my mind was "I need to stretch this headphones a bit, this clamp is annoying".
So having said that, I believe that I should resolve this (personal) issues that I have with Q40's so that I can listen to it comfortably and give it's sound a fair assessment.
I am thinking of using Brainwavz HM5 pads because the stock pads are too shallow and thin for my liking. I also got a vmoda cable the other day, but did not really notice any sonic difference when compared to the stock cable.