We've got a 3 bay Evocept with pioneer 107s in it, works perfectly.
Of course we bought it for small runs (<100) and now a client wants 500 including printing, you can never win.
The robotic duplicators also work well but they do seem to need a bit of mothering and a many need a PC.
Bob.
Take a look at http://www.mcnallysplugandplay.com/ We bought a stand alone 8X three disc duplicator from Gary about four months ago. The price was good, Gary stands behind the things he sells, and the duplicator has paid for itself already. No problems of any kind. The drives are Pioneer and it has a hard drive as well.