I have the Marantz, although I bought mine new at my dealer for $250. Didn't want to take a chance on the refurbished units.
I bought the changer to replace my older Marantz CC-38 changer. I wanted to send a digital signal into my receiver's DACs and the CC-38 did not have a digital out.
I really like the 4300, it sounds wonderful, looks good, and functions very nicely. However, I do miss the changer mechanism that the older Marantz CD changers used to use. It was so much faster and quieter, you could hardly tell it was changing discs. The 4300, although pretty fast changing discs, is slightly louder and slower to start play. Don't let that fool you, though, it's still a very nice changer. It does offer 4 disc exchange while playing the 5th, something the CC-38 didn't have - you could only change 3.
Overall, I really like this changer. It's a great deal for the money.