I have had my IDA-8 for just over a week now....it was a demo, so I have no idea how many hours were on it, but I am thrilled beyond words with it's performance. It scales up to match my various speakers incredibly well. It made my cheapy Energy C-5's sound like a far more expensive speaker by adding detail and refinement, but yet made my Equation 15 speakers sound better than I have ever hard them sound. I have several other speakers that I can't wait to hear it with as well.