Jeff Rowland Design Group Synergy line preamplifier
One of the differences between mass-market and high-end audio is in product model longevity. By this I don't mean that high-end products necessarily last longer—although I think they generally do—but that models remain in a manufacturer's product line longer, perhaps being refined in an evolutionary manner. This helps products retain their value, and, when new models are introduced, these involve more than a cosmetic upgrade and some additional bells'n'whistles.