Well, FreqNasty - i think you missed the point entirely. DVD+RW-DL is a lot worse. Remember the CD-RW/CD-R difference? most players played CD-R and most didn’t play CD-RW? Well - it’s the same sort of concept here - the DVD+RW-DL uses Phase Change Crystal Layer to do the recording, and these crystals have a much much lower reflectivity. Most devices wouldn’t even recognise it because the reflectivity has dropped BELOW the specification for DL Standards. However, DVD+R-DL and DVD-R-DL are all similar, with reflectivities sitting inside or on the edge of the standard. That’s why they … on the most part … work.