I've been using an APC 15 (I think) on my Panny plasma for the past 3.5 years. Not sure it improved picture quality (then again not sure it didn't since I didn't do a detailed A/B comparison), but through heavy use and multiple power outages and brown-outs my plasma is still running just fine. One day over the summer while we were having rolling power issues I saw a yellow light lit on the unit and didn't know what it meant initially, but turns out our power to the house had dropped below the specified range and the unit was boosting the power to the TV -- pretty cool. I can only assume that helps the TVs power supply. Anyway, seems to have worked well in preserving my TV through some tough storms so maybe add it to your list of products to consider.
