I just sold a Philips DVD985 and was able to play with it for a week before getting it to the customer. Discs made on it will work with the Pioneer DV444 progressive, but not with the DV-F727 301 disc changer the customer had. It also did not work with his Panasonic 27" TV/DVD/VCR.
I went to Best Buy with a disc I had made on it and tried it on 25 DVD players there. It did not work only on the Samsung DVDM301, DVDN501 and the Panasonic DVDCV52 and DVDRV32. It worked fine on the Panasonic progressive model DVDRP56 and all the other players they had.
It seemed that it worked on all the newer models.
"Regarding surround sound, I know musicians too well to want them behind my back." -Walter Becker