This review comes from the perspective of a guy who just wanted a bigger screen and a better TV. I am not one to pick nits regarding audio and video matters that others may find annoyingly noticeable.
We replaced our 32" 720 with this 50" 4K and it looks pretty amazing. Originally, my Blu-Rays looked too real and vivid to the point of being distracting. Luckily, there is a very easy feature via the "*" key where you can tweak the picture quality to "Movie", which makes films look the way they were intended to be viewed by the filmmaker.
However, for documentaries and non-fiction viewing, I do prefer to let this TV show me the pure clarity. If you throw on one of those recent nature documentaries released by Netflix, the picture quality will blow your mind.
I purchased this with the TCL 2.0 sound bar, which also does the job the way I expected.
Downsides? My regular DVD collection is massive, and the magnification of this TV does not make them look good. My player apparently scales the DVD's, but they still look pretty bad. However, I expected that this would some day happen. I should have learned the same lesson from when I threw my VHS tapes into the garbage, but maybe next time I'll learn.
Overall, this TV does the trick for my family and, if we are stuck indoors this winter due to Covid, then I look forward to many good viewings.