look at the pinned it will direct you to the backup section and link on DL media in the FAQ
(
http://forums.xbox-scene.com/index.php?showtopic=577735 ).
The sony dvd are made by Ricoh (for the most part).
I would strongly advise getting verbatim as the difference in quality between the good (verbatim) and the others is much bigger for the DL than the SL.
Really worthed.
rgds, soso