Hi, I use the WD player along with a Lacie 320gb USB powered drive. No stuttering! I can only fastforward or reverse, at the mo, you can't jump chapters. Apart from that I've had no probs.It has phono/ 2x USB/HDMI and an optical sockets. The WD is a little bigger than a packet of 20 cigs, the drive is slimmer but slightly larger.
Hope this helps.