A 43" UHD TV would have the same dpi as a 21.5" FHD monitor, so I guess the viewing distance should be about the same for both, if that helps put things into perspective. I'm assuming you don't intend to use scaling.

An important thing to keep in mind is there are actual computer monitors out there that match those specs and cost about the same as a comparable TV. If you don't intend to ever use it as an actual TV, that would probably be a slightly better choice as a TV might have unwanted picture optimizations or force you to use a remote to turn it on/switch inputs etc.

I just measured, and it is 34" from my eyes to the screen. My old monitors were a few inches closer.

I'm sitting about 2 feet from one right now.

The dot pitch is about the same as a 22" 1080p or 27" 1440p monitor, so really it's like having 4 1080p displays but with no bezels and a much smaller desk footprint.

It's great, cheaper than those ultrawide displays but with more resolution at the top of the screen for music players, email, etc. The built in TV speakers are more or less the same as desktop speakers but with no extra space.

Having a large 16:9 format display is also a million times better for games and fullscreen video.

My only complaints are that the refresh rate is limited to 60fps and the display lag is 20ms. I'll probably upgrade when HDMI adaptive sync becomes more commonplace.