Takeone: I have had both Nuforce 9SE and Channels Islands (D-200) in my system in the last couple of years. Without going into an extended assessment, my experience would be: Nuforce-Excellent and deep bass control, RFI can be problematic, especially if you have a tuner in your system, highs can have a glare but can be tamed with the right cabling. I've heard great things about the V2 upgrade...but haven't heard them myself. Channel Islands: Less bass authority but you can listen to them all day with little fatigue, no RFI issues, a pleasant personality but the goose-bump factor wasn't there. Last year at RMAF Albert was running a pair of 4jr's MKII (I beleive) with a new CI model D-400..twice the power of the D-200s...sounded wonderful. From my perspective, the Spectron takes all the best attributes of class D and a few of attributes of tubes and rolls them into one.