I bought this pre amp after reading a lot of positive reviews on the internet. I use it only for headphones (AKG 500, Beyer Dynamic DT 770 Pro and Sennheiser HD600). The amp was delivered as expected en well packed. The look and finish is beautifull, construction very solid and the potmeter feels very good and even on all volume setting. The sound is very good paired with the HD600! A touch of tube warmth and detailled sound with good space. I've orderd som Vosnek tubes to try. I also try it with HD 605 wich I expect soon. The unit is stille burning in (3 days now) but very happy so far. For this price very very good! If you have a HD 600 or Beyer DT 770 pro it is a serious upgrade compared to a standard headphone connection. Highly recommended!