Pros: Smooth, well balanced sound, easy setup, good build quality/materials
Cons: Can be slightly civilised at times, heat management is questionable
This has been a very nice DAC/Amp for my Koss Pro 3AA phones, and while I haven't figured out some of its features (e.g. the gain controls on the base of the unit) I can understand the use it would be for someone. The only thing that concerns me is that after several hours, both the casing and the tube become incredibly hot and this contributes to distortion that I experience regularly. I have to unplug the valve regularly, and this raises concerns for me about the longevity of the electronics. Otherwise though, it has served me well, but anyone who is a sucker for reliability should probably stay away.