http://www.hometheaterhifi.com/cgi-bin/shootout.cgi?function=search&articles=all&type=&manufacturer=6&maxprice=0&deInt=0&mpeg=0#PanasonicDVD-RP56

Panasonic - DVD-RP56 MPEG Maker: MEI
MPEG Model: MN677533MP
Deinterlacer Maker: Genesis
Deinterlacer Model: FLI2200

We are both right to be honest. According to Secrets It uses the cheaper Sage/Faroudja but according to Panasonic it uses Genesis. If I was a betting man I would bet there was a production change somewhere in the middle and they switched for whatever reason. In the end, the difference is marginal at best anyway. The Faroudja and Genesis are both good chips with Silicon Image or Zoran being the king of the heap.