Using Sony 300 disk CD changer as transport

I am planning to purchase a DAC for my sister who currently is using a Sony cd changer mostly as a convenience. Preferrably I would rather buy a cdp since it is probably beeter in term of performance, but my sister doesn't want to have to change disk every time.

So I wonder if the Sony is a good transport and it is worth it to buy a DAC at all? This particular model only has an optical out.