This is the same scaler in both my Onkyo 805 and my Denon 3808 (yes I'm a videophile)and although I don't use the scaler in my onkyo (older Pioneer RPTV w/ no HDMI) my Denon is hooked up to my Plasma and I have it turned on and it really made the image sharp and clear (even HD content seemed sharper)

Onkyo makes great products and this months issue of HT Magazine gave the 606 glowing reviews, although with five speakers going it reached 81.2 watts per speaker at 0.1% distortion (which is very good for a budget reciever) and reached 73.2 watts at 0.1 distortion with seven speakers hooked up. (anything below 1% distortion cannot be heard)

Your picture quality should be just fine with this reciever using the scaler, and as mentioned if not, you can always turn it off. You'll like what Faroudja DCDi can do.

Another thing to get great picture quality is make sure you plug the TV and reciever and any other HT gear into a surge surpressor to clean up "dirty electricity" because trust me it can affect picture quality and sound. Don't get the higher priced Monster brand, a 60.00 Tripplite Isobar from Officemax or Staples will work just as well as the Monster brand costing 500.00 and will clean up the picture.