I've got one plugged into the system now with a pair of Gallo Grapefruits. Its early days but so far it seems astoundingly good. Huge increase in dynamics, much better instrument and note definition, tons of round earth virtues with no downside whatever that I've identified: all important musical virtues still intact if not enhanced. Whilst it does improve all music it majors on classical and acoustic but also stuff that needs lots of propulsion to really hit the spot - Dreadzone and the like. Alex