Just wanted to say I really like your guide here and what you're doing.
Based on all the research I did, I purchased the Sennheiser PC360s because they were known to be the best headsets on the market, and I have to say I wasn't that impressed with it. I came from using the PC161s which are honestly one of my favorite headsets. I know the Sennheiser brand and their quality, so I was expecting to be blown away coming from a lower end model. I even purchased a separate dedicated sound card just to optimize my experience.
I found that although the clarity is good, overall applications such as music or movies, they weren't really anything special. I was happy enough with the sound quality, but the major issue I had with them was the discomfort from clamping. I have a pretty big head, and I couldn't have them on without adjusting them constantly. That alone really killed it for me. I stretched them constantly over my PC case (which is white, and now has some black impression marks from the earcups from the pressure..) and they would feel great for half an hour, and then start clamping my skull again.
I've decided that for me personally, I'd rather sell these and buy ones that are of "lower" quality that provide better comfort.