I just returned my 2500. The drive could not reliably read back DVD-R discs that it itself had written.
Over the last few months I experimented with different media - recording twenty 200MB files to Datawrite Yellow (GO4) and Datawrite Classic Grey (fuji).
On every disc - of the 20 files written, I could only read back files 1 to 6. Could not read files 7- 20.
To be extra safe I wrote at low speed (x2) to the x4 and x8 media.
I believe the drive was writing correctly - the discs could be read in other DVD drives.
I have seen lots of posts reporting similar problems.
Is the 3500 any better? I’m not concerned with speed just data integrity.