Recently I purchased a used RP91. I was interested in it because of the auto scaling of non-anamorphic DVDs. I was afraid that it would have inferior picture quality to the XP30 that I also own. I was pleasently surprized that I could not tell a difference in PQ between the two. I mainly watch film based DVDs and on only rare occasions do I watch video based DVDs. Could this account for the fact that I really don't see any PQ difference? One area that the RP91 really excels is that it can play DVD+R disks that the XP30 pixelates rather badly. The RP91 plays them without a hitch.