Why bother upgrading though? DVD+R disc prices are low. If you use the BenQ bitsetting tool to burn the discs as DVD-ROMs, they have a much higher DVD player compatibility rate than DVD-R discs do.
I upgraded mine but I don't know why I bothered. I will burn off the few -R discs I have and stick to +.
BenQ DW800a with dual format firmware (8-4-12 +, 4-2.4-12 -, 24-10-40 CD) (in KHypermedia clothing)
TDK VeloCD 5201 52-24-48 USB 2.0 external
BenQ 5232W 52-32-52
LG GCE-8381B 48-24-48
Yamaha 8824E 8-8-24
Ricoh 6201S 2-2-6 SCSI