I mainly use it as an amplifier for my acoustic guitars or PA for our singer at rehearsals, combined with my Behringer MIC100 Tube Ultragain. For transducer guitars, or even my mp3 player, I use the line input, for (instrument) microphones obviously the mic input.
I really like that it just reproduce the sound I'm putting in or through, without all the processed sound available on acoustic amps, which I find unnecessary features. It gives my acoustic guitars a very pure and clean sound.
It has a really sturdy finish, but is still very pleasing to the eye in an industrial kind of way.
Great as a monitor, but also very versatile!