1: That's a JVC brand TV, I don't know much about JVC LCD's, but in my mind, I figure I might as well by a RCA brand or something.
Oh, and it's only 48", has no wifi, and isn't even a smart TV.
2. besides not being available for purchase (from your link at that price), it's a refurbished product.
and the only places that do have it available are used for over $550/New $699
3. This is another out of stock product (in your link at that price), and even though it is curved, it is also only 48".
In stock used is way more expensive than the 55" Vizio, so you know the new one is much more than that ($900+).
so I think the 55" 4k Smart Vizio for $599 brand new w/ wifi and a full keyboard remote is a pretty good deal compared to what I've seen, and what you've just shown. And even though Vizio was considered a low tier brand originally, I think dollar for dollar, price to features, cost to value, it's one of the best TV's you can get. I own 3 of them. This would have been the 4th, if I had the money to upgrade at the moment.