I gave the NuPrime to my church where it is doing an adequate job powering the bass unit of a Bose Panaray set. I am still quite satisfied with the Marantz for my HE-6. I have been told that if I had sprung for the ST-10 I would have been happy, but the Marantz satisfies for half the cost. If I was flush, I'd have bought a Benchmark. But I wasn't, so I didn't. The Marantz does not leave me with an upgrade itch.