Don't be too hard on Vizio. That brand is way above Sova, etc, and has become a pretty bigtime player. If I can find the news article discussing the main HDTV producers I will post a link, but it was very positive toward the brand having come from nothing about 5 years ago. Consumer Reports gave it a very favorable rating and said it had only slightly more defects than the big dollar plasmas. The CEO has stated that their goal is to bring the quality of the big names at far lower prices and he intends to continue being very aggressive in quality/price relationship.
Viore, OTOH, is a brand unique to Wal-Mart from what I can see, I have personal experience with that brand since I bought one of their plasmas BF of 2005. It was only EDTV but had a great picture and we really liked it but it broke down within a few mos, then came the repairs problem. It was very hard to reach anyone for service and to make a long story shorter, it turned out that the brand was in some way related to Vinc, but even further upstream, Akai. Akai did take care of the problem by letting Wal-Mart return it but they could not replace it. So, I got my $ back after 4 mos.