I'm using a 32" Samsung HDTV (1080) as a computer monitor right now. It's been working well for several years, and I'm happy with it. No problems.
There's a Toshiba 40" HDTV (1080) in my MBR. It's been working well for several more years than the Samsung, and I'm still happy with it. No problems.
I've had a 65" Sony 4K TV in my great room for about 2 years now. It continues to work well. No problems.
Right now, if you stick to the midpoint of the main brand (Sony, LG, Samsung) product lines, it's hard to go wrong. BUT . . . if you're using some old "legacy" components, be aware of connectivity; in particular, when I was shopping for my latest, I saw the Samsung TVs only had HDMI connections for additional components.
Larger screen TVs can be a little "tippy" . . . depending on your layout, you might want to consider a wall mount. I used one for my 65" unit and in hindsight, that was a really good decision.