Ok, I got the Cendyne Lightning III today, 40125S, and flashed it using the VS02.bin firmware. After flashing I was able to successfuly burn at 48X CAV. However, a surface scan of the disk reported between .5 and 30% errors. The disks were readable and I could find no appearant file corruption. I flashed back to the original 40125S firmware and now when I burn no errors are reported by the surface scan.
Oh well, guess I can't win them all.
I will probably return this burner and wait for the real 48X.
Note: I used Nero CD Speed to perform surface scans of burned disks.