Started out meh but after full break in period passed, sound really changed. Overall, very happy with the setup. I have not heard anything better than this yet - and I am not sure why I would need to. I am using it with Massdrop JBL monitors as a setup on my work desk at home, mostly streaming music from Spotify (with maxed out quality) and Digitally Imported. I can't find any fault with the sound this combo produces - I can clearly hear all individual instruments, sound is balanced, vocals are lively, present, and up front, bass is tight, sound stage is wide and there's enough details there for me to want to re-listen to all my favorite music all over again. One thing to mention though - now when I stream lower quality music I can immediately hear it. Just sounds flat and dimension - less, but that's expected. Build quality is great, have not had any issues with volume knob, tube, or anything else, really.