This is like my PSU on steroids xD Double heatpipes was a nice surprise, some review criticized mine for heatpipe cooling only main rectifiers, but works fine at this wattage level. Should be plenty options to choose from Zalman now with 500W, 600W, 750W and this 850W version in the heatpipe series.
Weird about that missing power switch, I'm always timid plugging in power cord without a power switch in PSU, blue sparks aren't nice
Not that it would keep my from buying it, if I was in need for so much power, but seems like it was given in this price point.