This is a powerful amp with a beautiful, natural sound and has been used very few hours and treated like it deserves. From the "The ABSOLUTE SOUND" mag: "....the ST-150 can reproduce the ephemeral quality of a live performance to a degree that is so astonishing... I just sit and listen to see how much detail I can actually hear, and how well I can distinguish one instrument, or one voice, from another....demonstrates fine harmonic balance...You can almost feel the players at their desks on the subtly layered soundstage.....transparency is so good that the listener is more or less in the room with the performers, an effect sustained even at louder volume levels...And the sound of the pianos! I loved the liquid beauty of the notes.....etc etc." The VTL is very powerful, it drove my Martin Logan SL3s beautifully. I used it only late at night for dedicated listening sessions, so it only has 200 hrs of use. I use 2 solid state monoblocks for everyday use, the VTL is special and has been treated as such. I now have 2 kids, and we are downsizing the whole HiFi system.