i've had mine for a little over a month now, and i'm definitely impressed with this tv. firmware updated when i first turned it on, but it's stayed at 1.1.5 since then. i definitely agree with all the comments here reporting that the image quality improved markedly with time. my set also had horrible stutter at the beginning, so much that i considered returning it, but that too is now gone. i've got it set up with the cnet settings.
so far i only have 3 complaints [only 2 of which are directed at vizio]:
1. usb drive must be formatted to fat32. this means you can't have a file over 4.3gig. how many full length 1080p [or even 720p] movies are less than 4.3gig. none. means the usb drive is largely useless for full length movies at any decent resolution. fat32 was released in 1996. the fact that we're still using it is a travesty.
2. the dlna client is severely limited. anything i can play from usb i should be able to play over dlna, but that isn't the case. usb has thus far been able to play anything i've thrown at it. dlna has been able to play only one thing i've ever thrown at it, and it looked terrible. if this was fixed, i wouldn't need the usb drive mentioned in point 1.
3. i'm surprised at the lack of 5.1 channel content on netflix. i can watch the original season of star trek in dd5.1, but many movies that have come out in the last two years are only two channel. this obviously isn't a vizio issue, but it's something that i was a little disappointed with, and since lots of folks might consider this tv for its built in netflix app, i think it's relevant to this list.