Well, depends on how they made the copy.
Before 2001, all the D-version DVD in china are not good, some even from
shot_version or video tape.
But last august, I went back. I found that all the DVDs are well printed
on the disc and the contents were almost same as original.
About quality, the new D-version DVDs are very good, I have "15 minutes",
"vertical limit","6th day"..., around 20 DVDs are all very very good in
quality.
Normally, if I like the movie, I would collect the DVD. Divx4 is just for
some normal movie that I have not watched. I download them only. Compressing
costs too long time, though my pc is fast.
Sawol