On one hand, if the modified Music Hall sounds fantastic and your only concern (theoretical) is build quality ... I would say don't change a thing. I use my Music Hall with a vintage Marantz 2216B receiver and Acoustic Research 15 speakers (placed on top of an armoire, no less) and I love its sound. The only tweak to the Music Hall was I replaced its power cord with a Cardas Twinlink (btw, Signal Cable interconnects). I actually prefer the Music Hall to a Pioneer PD65 that I use in a secondary TV room system. Its build quality seems to be heavy duty enough ... said differently, I have not read anything negative about the Music Hall's build quality. The SONY SCD 555 ES is just a different animal in terms of ruggedness. As I understand its build design and the SONY website does/did a better of explaining this, it is actually two separate mini tank units joined together to make one mother tank of a unit. The only complaint that I have read about the SONY is the occasional failure of the sled motor ... but this does not seem to be a prevalent problem. I have the SONY paired with better components (Musical Fidelity A3 amplifier; Acoustic Research 302 classic series Speakers), so the system sounds better (smoother; more detailed). If you can pick up an older, new stock or well cared for SONY SACD ES reasonably priced ... do it, because they are great machines. Otherwise, I would be tempted to stay with the Music Hall ... given how satisfied you are with it. You have it paired with some really nice and well regarded/performing equipment. Regards, Rich