The Bryston 4B-ST is an outstanding amplifier sonically and operationally; will drive almost everything; is not subject to ground loops and similar irritations; and is supported by a company with an exceptional service policy. In the unlikely event of repairs(and I speak from experience having many years ago once damaged some output devices through a mistake I made and not because of a fault of the amplifier) service is immediate and unquestioned and free of charge (other than shipping)and the turn-around time through their facility in Vermont is almost always 24 to 48 hours. Finally, when you call with a question, you actually get to speak with a live technically competent individual. In fact, I recently e-mailed Bryston with a question, and received a lengthy and useful reply from Chris Russell, who is in charge of Bryston design and manufacture.