Well, I can answer the question probably as good as anyone. I purchased the full Innersound system (speakers, amps, crossover/amp, phonostage and preamp) in November 2001 (and have just upraded the panels for such a rediculously low price, I am still amazed). They sound incredible. Roger has been there with me EVERY step of the way WHENEVER I needed him, call it Innersound, Innersound LLC, Innersound abc or Sanders Sound. You deal with Roger, you get him, his support and the best products on earth. I am incredibly fortunate to have had him recommended to me years ago. I could never think of changing my speakers, amps and preamp. (Maybe Sanders amps but that would be it).