We all have different ears and to each their own. The TH-900 replaced the HD-800 for me, along with the LCD-3. It just fits the sound signature I prefer more, though I've held on to the LCD-2.2s and can't seem to motivate myself to part with them.
There have been a few headphones I've tried that within a few listening sessions, I knew they were not a match. The nice thing is that we have so many wonderful options available to us.
Yep-purely subjective! I've really appreciated the comaraderie that exists here in the thread-and to a lesser degree in the HD800 threads as well. I wish I could fall in love with this headphone like (most) of you have, and as I (FINALLY) did with my HD800 journey. And what a trying journey it was lol...