I have several 2 Vizio televisions a 50 inch Plasma, a 23 inch LCD.
The only problem I ever had was during a Storm in early January 2008. During the middle of an extremely heavy wind, some wires on the Utility pole came loose shorted together and sent an extreme voltage spike down one pole of my service wires. I lost my (new) High efficiency Washer, Microwave, Network Laser Printer, three computers, several burned out Light switches, and my 50 inch Vizio Plasma TV. The Circuit boards were visibly Charred in several devices.
I replaced my 3 year old 50 inch 720p Vizio plasma, with a 50 inch 1080p Vizio Plasma. Never had a problem at all except for the Electrical issue that fried my Home.
My Brother purchased a Phillips Plasma at about the same time I purchased my first Vizio. Since then he's had his Display Glass replaced, and recently a tech come out to replace a Circuit board. At the time he purchased his Phillips he mocked my purchase of a Vizio.
I'd say the Vizio is better than most other brands in the same price range. While I'd say Sony, Samsung, or Pioneer are better, but there is also a large price difference.
John