Worth every penny if you can get a good fit and find them comfortable. I always loved the sound from these (once my #1 favorite), but I couldn't deal with the discomfort. If you like the sound of the SRH-840, the AKG K240 Studio is another option that's more comfortable. Check out this graph:
Wait until after the headband loosens up a little. After I've owned mine for about half a year and its all loosened up, I can say it's without a doubt one of the most comfiest headphones I've worn out of the 20-30 that I've demo-ed.