I've been running the 55" for about 5 days now and have to agree that when the picture is great, it's great. The clock is annoying, but can be fixed by plugging in a coax antenna. Hopefully, Vizio will fix that with a firmware update.
However, I have noticed significant blooming in the corners and "flash lighting" at times similar to what people have noticed on the 50" models. Is anyone with the 55" experiencing a lot of blooming with smart dimming on or is it just my tv? During the day it's not that noticeable, but at night, it drives me crazy sometimes. I'm coming from using a 47" XVT2 which has been great and didn't have a lot of issues with smart dimming. I've tried using the settings posted, but haven't had much luck reducing the blooming effects with smart dimming on.
In addition, has anyone been able to force the firmware following the advice in the earlier posts? Mine is still running the earlier one.