My advice: Wait and buy a 4K telly in a few years. Here is why:
1) The price will come down over time, so by the time your current television is worn out they'll be much cheaper. You would be able to buy a much better telly from a decent maker (Sony, Panasonic, Samsung or LG) for the same money.
2) There are vanishingly few 4K programmes at the moment. Although a 4K telly will appear to make a normal HD programme look good this is just electronic trickery. The very best that an HD programme will be is 1080i (broadcast and cable) or 1080p (Blu-ray). You would have to also buy a special type of Blu-ray player, and appropriate discs, that provides 4K output to get the best from this telly - even more expense for you.
3) Vizio is not a "proper" manufacturer of televisions. They are "box shifters" who assemble low cost (hence low quality) components and then stick a badge on the box. Other ones of this type to avoid are Bush, Alba, Baird, Hitachi, Grundig, Technicka, Tevion and any other "supermarket own brand".
This is why you seem to get a "lot of telly" for a low price. The result is something that will develop a fault within two or three years - and they're not worth repairing because they can develop other faults even after the first one is fixed.
4) Ask yourself really why you want this? Challenge your motives - I bet that they won't stand up to rational analysis.
This means that if you are a "gadget man" and just want something "new and fancy" to boast about now, regardless of the fact that you have blown nearly $1500 on something that cannot be justified on grounds of performance (lack of 4K material), and will be a pile of junk within three years, then no rational argument will stop you.