I have owned the Gilmore Raven Stereo Class D amp and I have just traded it in for a pair of the Gilmore Raptor monoblocks. I auditioned the Raven against the Nuforce 9 SE v2 and it was far superior in my system (Supratek Chenin tube preamp, Zu Druid Speakers, Zero One Mercury CD-HD player). The Nuforces caused audible interference with my Suprateks, I could actually hear the hum from my listening position. Since others have not seemed to experience the same, all I can say is that the implementation of class D is highly dependent on the rest of your system. My system could not stomach the Nuforce's switching power supply and it's resultant RF noise, the Gilmore's linear PS was a much better match - your mileage may vary.
I have moved to the Raptors since I have recently changed my speakers to vintage Infinity RSIIb's - they need a LOT more power than the Druids!