It's a great TV for the money. The picture quality is spectacular (I own the 75 inch), especially when you play YouTube videos in 4K. If you wanna see the best video quality, play the 8K videos (even though the TV is not in 8K) because those videos simply push the processor to its limits and that's where you can see the real image quality of the TV, which will not disappoint you. ;)
The USB function works well for playing most video types, and is relatively quick to load. The menu is alright, nothing much to cheer about. I also have a sound bar from LG hooked up via BT and OPT, and it connects easily and sounds great. The TV speakers are okay as well, but obviously they cannot be compared to the quality of a sound bar.
It's probably one of the best TVs you can buy on the market for this kind of money. The hertz are "low" compared to a few other models with higher refresh rates, but you can only see high refresh rates if you play PS5 or XBOX. You'll never get those high refresh rates via a regular channel on the antenna or an HDMI box. So, the whole refresh rate topic is overrated and not worth paying 300 euros more. I played PS4 on it and it definitely looks much better than on a standard HD TV, even though the resolution is the same at 1080p. This means that the TV is certainly doing some sort of upscaling because everything on 1080p looks a lot smoother in general.
Buy it without hesitation!