Hello, I got a Tecon Model 55 a month ago and am very happy with the amp. I have tried it driving my main speakers, Meadowlark Ospreys, and in my office/computer room driving old large Advents. I does a nice job with both. I normally biamp the meadowlarks with Quicksilver 60wpc amps, using a Promitheus TVC. The main difference with the Tecon is the bass is not quite as defined, quite full though and on orchestral recordings, the sound is a little stressed in forte passages. With jazz, rock, acoustic recordings, the sound is quite full. Not as clear overall as through the Quicksilvers and TVC, but by no means muddy. In the office I have the Tecon running with the USB out of my computer. The onboard DAC is quite decent, sounds good with utube, digital downloaded files, internet radio stations. I sometimes turn it all the way up with space/ambient type music, no distortion noted, deep bass and pink noise simultaneously! And neither of the speakers I've used are particularly efficient. The Tecon 55 is a very good deal, nicely put together in my opinion. I'm also fooling around with the MiniWatt S1, 2.5 wpc! Cheaper than the Tecon, very clean sounding amp! I just need to get some efficient speakers. There are reviews of both out there!