I have heard the littledot mkIV, and it pretty much sounded like any other solid state amp as well so i though eh, littledot is just another shammy company... but then I discovered the MKIII - and i ordered on the next day!! TRUE tube sound, warm, euphonic - FULL....i can list adjectives all day, but until you hear it for yourself, nothing I say can do it justice. You can also go get ripped off, i mean go buy one of the woo audio amps for much more, and you will either get the same sound as an o2 (firefly) or a similar sound to the mk3 at over 2...