This thing is almost always on sale at least on Amazon. So it's not a "special occasion because sales are low". Reviews are mostly positive. You're getting a smart TV (Netflix, Disney, Prime etc) + Monitor with USB-C charging your MacBook. I've been using a 4K Display (not this one) for years now and I don't know how people are complaining about bad scaling. MacOS works perfectly fine with 4K screens (see iMac has 4K*incorrect, it has 4,5K) and there are no artifacts or whatever.
If you want an even cheaper option look up the Samsung M7 instead of M8.