I have the 8001 and really like it!!!I don't use it for Red Book as I prefer my Musik 1.2 and Astin Trew Tube players,however;it is very close to the best Red book CD sound I have heard.I have not heard the 8003 or 8004,but I prefer the styling and song read-out(in SACD mode)offered by the SA 8001.It is a very reliable,solid and competent player/transport.