I've owned both a Little Dot MkV and a Woo 3+. I sold the LD because it just didn't drive my HD650's adequately, however it WAS a good amp, especially with low impedence phones. The Woo 3+ (or Woo 3, as it is now...the one without the preamp section) is my current, and for the forseeable future, ONLY amp. The two are very different beasts (SS vs. tube, among a lot of other things), but I much prefer the design, topology, style, elegance, and most importantly performance of the Woo. Fantastic point to point wiring, simple and elegant design...it's a masterpiece in minimalism, lol. I recently had it recapped by Jack with Black Gate output caps, and it's still breaking them in, but the improvements made an already great amp amazingly better (I'm at about 55 hours or so...long ways to go yet). The imaging, detail, and soundstage were impressive before, but now it's just stunning.