I have a Luxman Japan SACD player using a voltage converter and it sounds fantastic.
However the CD tray occasionally does not stay open and Luxman North America will not work on it. I would have to ship it to Japan, which is expensive and time consuming. The tray works 95% of the time so I am good, a more serious flaw and I would not be happy.
Also given the relatively low power demands of a CD player the transformer is a non issue. I would be wary of using a transformer on an amplifier which has much higher more demanding power requirements.

