I was worried after reading a couple bad reviews that I would not like the TV. After receiving the TV and having it almost a month now I am VERY pleased with the purchase. This is a great 4K TV for the on sale price. If I would have paid the $750 original price I would still like the TV, but would expect a few more features. I bought it on sale for around $450.
The 4K is perfect if you have a UHD player, Xbox One S, or other place to get 4K content. The TV is smart, but not fully smart with the ability to download apps or surf the web. Built-in streaming services Netflix, YouTube, Pandora, a cartoon streaming service, and Accu Weather app come ready to go. It has multiple HDMI and USB slots to plug and play other devices, or play your music or video straight from a USB stick. Cast Netflix or YouTube from your computer or phone to the TV, but to cast anything else you will need a device like the Amazon Fire Stick, or Chromecast. Sound is not a problem, it sounds good enough for my bedroom, but if you really want better quality you'll have to purchase a soundbar, surround sound system, or new speakers.
Overall, it is a great TV!! If you're buying this on sale GO FOR IT!!!