I've been listening to my Vali 2 for a few days. Very nice with my HD800 & HE1000, I don't find much lacking with the sound given its price & tubes. Build quality was exceptional and it looks much nicer than the photos. Only complaint is the white LED on the front is a bit too bright and distracts from the nice warm glow. After a couple of days of listening I was able to hook it up to my switch box and compare with the O2 amp after very careful volume matching. Both amps sound very close with the HE1000 however the Vali 2 might have had the appearance of a bit less detail, and the edges were a bit rounded off making it a bit smoother in tone but with a slight 'haze' over the sound. The O2 was cleaner and sharper. Pretty much typical given SS vs. tubes. I was able to pick out the Vali2 14/20 times blind. Overall, great little unit. I'm really happy with it.