I made a backup of Transformers from an HD-DVD, re-encode it into blu-ray format and backed it up on a DVD+DL disc. It does play and sounds great, but i'm only getting 4:3 format where the picture is squeezed to fit with the black bars on the side, not the usually 16:9.
I played the disc in a PS3, it works fine, displays 16:9 and the quality is superb HD.
I tried updating the firmware, but it would render the player useless playing AVCHD DVD disc. Revert back to the old firmware, i'm able to play the disc.