I bought a TLC 55" Roku at Costco this winter. It was their 6 series TLC model in this size. I did some research and learned that TLC had a solid reputation and have several models in each screen size with a wide price range. When I bought my unit it was the last one left in a box at our Costco and the price was well below the price around Xmas. Best Buy currently has the same model at $599, I paid $379 which with my Costco Visa also provided 3 years of warranty coverage. I have been very happy with it.
In this process I found Vizo has really cheapened what they offer compared to what they did when they first hit the market in the USA. My first LED is a Vizo - still works great. But, the Vizo did not even offer a built in tuner in their units at Costco with out moving into their upscale models which were near twice the price I paid. I cut the cord several years ago and use an antenna, netflix and some of the freebies offered on the Roku TV.