I had one that was used but in what I thought to be good shape. My problem was that starting a roll was a real bear. I don't know if it was open or closed throat, but I sold it and bought a JD 530 and I could look at a ww and it would load.
One thing I did like about it was that the 4" belts had a couple of inches of spacing between them so you could see that your bale was adequately tied before dumping. On the JD, the 7" belts are so close together you can't see the wraps and that has caused me some problems when the baler was malfunctioning and I didn't know it.