I have had the Panny for 4 months, HAD the Sony, and have a DTC-100. The software upgrade works wonders. I experience no dropouts after trimming a tree branch(!), The guide speed is much much improved. Of course the DTC-100 guide if faster, but you have to wait for program descriptions on the DTC. The Panny has the best upconversion, integrated Sat & OTA in the guide, even Local OTA guide info. The Panny has an aspect button on the remote making changing aspect ratio a task that takes a split second. I've never had a sync problem.
I haven't tried the Tosh/Mits/Huges clones, but the Panny is great...it ABSOLUTELY KILLS THE SONY! The only thing I did when I switched from the Sony is go buy a $14 Digital clock for the top of the ent. center! Read this months issue of TPV, it is the definitive source for pros and cons of current DTV STBs, sans RCA. The article echos my experience.
BOTTOM LINE-
BUY THE PANNY!
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TN55x81-TUHDS20-AVR210-AD800 Down...DTC-100, TSL3295HF, VSX-D710, DV434 up