I have used it for bass, synth and also guitar. Also in Live shows and in recording. Really like the Link Out option. Very useful buy. Before this we as a band recorded base directly into interface, now, we can record it and play through amp at the same time, and sound quality is definiately enough.
Also we are using this at Live settings, I had a gig, where I had to put guitar straight D.I. and this box did it's thing. Nice and sturdy. Happy with this purchase