I was able to spend couple of hours with PWD->Stratus->TH900.
I know it's too early to say but to my ears TH900 sounds really like a mature version of Denon D7000. I've had D7000s twice and D5000, sold them because of their high and muddy bass. TH900 solved most of my concern. tamed high,less recessed mid, bass is still little loose with stock 2A3s(EML meshed plate I have suppose to give more dynamics and tighter bass but haven't tried yet) but I don't know if I really want tight tight bass in this amount of bass quantity and impact it'll probably gonna give me a headache. yes yes Massive Attack really massively attacked me with their deep bass
I think Stratus pairs with TH900 wonderfully. I don't hear any hum, noise, hiss what so ever with low gain setting. Very lively, organic sound, great layer but again it's too early since I am still in honeymoon stage with both of them :)