I received my Das S Silent last Thursday, and its a pretty decent keyboard. Its gloss fits in well with most of my other electronics.
N-key rollover is lacking on PS/2, but 6-key on USB is decent enough for me. The USB hub does its job, and the whole board feels solid. My only issue with the board thus far is the FN key placement, but I plan to reroute the RWin key wiring to the FN key location, and vice versa.
All in all, the Das S gave me exactly what I was looking for (USB hub, brown switches, standard 104-key layout) for a price comparable to the other options I found.
EDIT: Well after testing 'qwas', it would seem that 6-key rollover isn't working quite as one might expect. Previously, I tested with 'asdfui', which does work. I wonder what the limitations of the hardware are (though if it were working as advertised, there wouldn't be any).