Bought one the other day. Looks like it's never been used, absolutely flawless condition. Has a slightly bass-heavy sound but is nice and flat otherwise (they really tried to make this seem "hi-fi"!)
I don't think this is well-known, it definitely wasn't well advertised at the time, but when an iPod of that era was plugged into the 30-pin dock connector on the HiFi it utilized a special EQ curve designed to optimize the musicality of the pairing. Only worked thru the 30-pin. I've got one around somewhere but to my fading memory, a vintage iPod + HiFi sounded absolutely incredible together.