I'll stop now.
+1 Exactly how I feel. Nice deep tight bass with slightly blooming lush mids (not Sennheiser lush though) and close to zero sibilance, which isn't surprising when you look at Tyll's freq curve. Upper mids and low treble falls off a cliff and if anything are sucked out. I don't understand how anyone who does not own a defective pair says these are sibiliant. What really surprised me about these was the speed.
They're not planar magnetic fast, but they do leave traditional dynamic cans like the HD650/D2000/Q701 in the dust in terms of transient speed and resolution is up there among the best sub $500 cans.. And for supra-aurals they do sound fairly "Big" more like circumaural (almost). I'm amazed by them every day and wonder why everyone on Head-Fi doesn't own one or even two... I guess fit issues and QC... sigh...