They are amazing pair! I was using tube amp last time, Lyr prior to Taurus. One thing I dislike about tube amp is because of the coloration, it makes the overall sound warmer. I like original sound of HD800 / HD800s without overall coloration. If there's one thing I dislike is the peaky highs only - that's all. Although HD800s is reducing those peaky highs, but somehow the transient is bit reduced, less lively. I owned HD800s last time, then go for HD800 with SDR mod - I am grateful that I got HD800 with reduced peaky highs and the bass somehow is improved. On top of that I use pure copper for both the headphone and the power cord.