Just day before yesterday I got my Q701! In lime green btw. I have to say they are awesome. Straight out of the box plugged to my laptop and they sounded great and played sufficiently loud. I really didn't seem to notice any difference plugged into my Yamaha receiver. Hope the amp brings something to this so I haven't bought it for nothing. :D I think they do pretty well with lower quality tracks too, might not be the case with the new amp though. Now I have maybe 10 hours on them.
Only thing I have to say is that I think they haven't opened up yet. The sound is maybe ever so slightly restrained, which might be too much to say. Anyway I wouldn't describe it in any way mellow or soft or lush. Maybe more like tight. I guess they become livelier as I play them. Any experience about this?
I really like them and they are a significant improvement over the K501. I feel the bass is just nice already. Its very present and indeed well extended but not in any way overpowering. And boy are these articulate. I hear every nuance of every note and cymbal hit (don't know of any better :D ). The work great with every kind of music, just very pleased with them. I think they are more revealing and articulate than the K501. Not by much, but noticeably. There might be some very slight tiring treble at rare occasions. Nowhere near the amount of my Nocs NS 400 at the same sound. Its this one sound in one game so I'm starting to think its the game and not really the headphones.
I also had a nice experience in a song I can't recall but the drums felt like I knew where they were in front of me. I could position the sticks running through the drums. Was quite nice. Haven't had any spectacular overly left right sound stage experience yet, this might change with the amp.
They are very comfortable but I, too can start to feel the pressure of the bumps on my head. And I do have pretty thick hair. I think that if you have a flat top of the head they are fine, but if its a bit pointy at the top the pressure isn't distributed wide enough but on the "tip" of your head, hence the pressure. I also have found it helps somewhat if you lift the band (from the sides with your forefingers) as you put them on, resulting in a lighter touch. Also, it helps doing the opposite. Pull the band from the sides so it gets more ground to rest on. If I could get a little cushion in between the two middle bumps, I would be set.