Glow Amp One questions?

Reviewed quite favorably on 6Moons. Maybe price too reasonable to be considered High-End? 8^) Any input on this amp?

1. Yes
2. 5670 from Jim McShane was a worthwhile improvement.
Audio Magus sells a replacement set of driver/output
tubes that are very nice.
3. Only tried it for a little bit with my Senn 600's but
it was the best I have heard them. Don't have too much
experience with headphone amps though.

I bought an 09. DAC failed 2nd day. Factory told me to take to a local shop. I guess you get what you pay for.