In the early 4k era, whenever I saw a TV used as a monitor, the eye strain was high. It was too bright, too contrasty, and generally, the picture was not great for using for things like programming. In addition, many TVs would do not-so-great things to the picture, the worst being digitally sharpening the image (which resulted in e.g. a halo effect around small text).
This might not bother some people, but it bothers me a lot.
How are you finding the display compares to a real monitor? How do I buy TVs which I know won't do this sort of thing?