I've own and currently own 4 Vizios, 2 RCA's, Kodak, Toshiba, and a Sony.
The newest one is a Vizio M321i-A2 and the picture on it is as good as the more expensive Sony of the same size that was purchased about 6 months before it.
All of the Vizios are still up and running. I gave one away and it has been through some abuse inside a cabin that is not heated all the time (temps can get -40 and -50 where it is at). That one is 3 years old and has been in that cabin for 2 winters. Cabin is a recreational cabin and in the winter is only visited every couple weeks. If that isn't a testament to the durability, I don't know what is. One of the RCA's went out on me, which wasn't a heartbreaker as the quality of the picture was pretty bad when compared to the others.
The Kodak is very old, one of the original LCD TV screens (4:3) and aside from the fact that every time you turn it on you have to re-choose your input, it works fine.
My son uses one of the Sony's and when we bought it we sat it next to a Vizio that was about 8 months older and the two looked pretty much the same displaying a DVD, but you could tell a difference in quality when playing a BluRay. The sony was better. Now, without getting all the model numbers together for this off the cuff review, it is pretty much useless info.
The reason I listed the part number for the first Vizio is because I'm very impressed with the picture on that screen and the sound is pretty darn good even though it is located in a spa room.
My brother has a Samsung and besides being really excellent quality, it is also one of the thinnest screens I've ever seen.