These are my first high-end headphones. I spent hours searching the web for info and chose the Shure 1840. As any other product with speakers there is some 'break in' time. 100 hours it said somewhere. This should have been reached by now. Before when I recorded through some Sennheiser DJ headphones and played the result over HiFi speakers it sounded horrible. Now when I play the recording over the HiFi it sounds infinitely better making it easier to sound good!
They are comfortable to wear on the head and the cups rest nicely over the ears giving the ability to record and listen for hours. And the build quality is higher than most!