Hey Gaslover! I haven't heard a Grandson yet, but I've acquired four Sons, an AmpzillaII, and a Gas 500. I've had them all recapped and gone over, with two of the Sons bridged. They are all fabulous, but the amp that knocks my socks off is, believe it or not, the Leach Low TIM amp. I found a pair of original LSR&D "Superamps" on Craigslist, had them redone and they beat the Ampzillas hands down. Speed, detail, linearity, but above all, truly flat response equate to extremely fine and precise transients. They simply display the particular recording you're listening to.