I just got one of those Boostaroo Revolution headphone amps (in black) for my measly 5 mW per-channel Walkman units for use with my D777SL (24 ohms) and NC60 (100 ohms in passive mode, 40 ohms in active mode) cans, as I see no need for a Penguin Amp, as those are meant for higher impedence headphones like Sennheiser or Shure units.

I just wondered if any of you own one, and what they have been for you.