For those considering using a TV as a monitor, here are my impressions - though keep in mind that I'm partly color blind and I really can't see things as well as I'd like, even with glasses (probably the cataracts). But since I generally do okay, I figure no reason to take on surgery for that at this time. After all, all surgery carries risk and eyes are kinda important!
Now, I generally sit 30 inches or so from the screen (still experimenting with that). The best thing about using the TV is that, for a pretty darn low price, I get a ton of real estate. So much so that I'm still working out how best to use it. For example, I may opt for a fairly small iTunes window - big enough so I don't have to do a ridiculous amount of scrolling, but since any video pops out in it's own window (which I make large), I figure I might as well save space the rest of the time for other things.
I used to work hard to set windows in a diagonal stack, so you could always hit part of a window to bring it right to the front. And, over time, I just knew which corner belonged to which app or document. But now it is more about seeing all of each window, deciding how much each one should be for the best overall situation.
I'm also working on using two desktops, specifically assigning certain apps to a specific desktop. And I suspect I'll have some apps that show on both. There is one less than perfect thing about this. Ideally I'd like to put the app in a particular place on the screen - but my preferences sometimes may want it a different place on the other desktop. But if you move one, the other moves with it. Well, not a big deal.
It may seem odd that I'd use two desktops with such a large screen, but I did that before. The only difference is now I can see the full window of each. I keep stuff I am working on a lot on one desktop and a few things which are less commonly accessed on the other. I tend to have a lot of apps open.
Now, while the advantages are obvious, what are the disadvantages? No matter how good something is, there are always issues, just like how the TB is great, but you still have to have a solid surface to put it on which may be an issue for a small group.
Well, one is that the top menu bar is still a bit small so, with my eyes, more difficult to read than I'd like (but part of that is my special vision issues). Another is when I'm looking at the far side - it's a long way! And related to that is how far you sometimes need to move the mouse - no longer a quick flick to go to the other side (I may play around more with the mouse settings - want to move quicker in those cases, but not be so responsive that doing fine control is a challenge!).
And sometimes pop-up stuff magnifies this problem. For example, I've been doing a lot of file checking "Get info" to see what has changed now that I've moved stuff to the Mini. Well, those info windows pop up on the top, far left while I may chose that option while the cursor is much further right. Putting that tiny text (I haven't checked yet to see if those elements can be made bigger) at the extreme edge means I keep dragging them more to the center for easier reading - which also means a long journey for the cursor again.
I'm definitely the wrong person to evaluate color. I know from things I've read that TVs generally need to have adjustments made, but with my eyes, the only thing I would be able to do would be to take suggestions I read online and hope they are right! Of course, I'll be avoiding that "Ultra HD Deep Colour" setting!
But, I do know some color I use in a Numbers spreadsheet look MUCH different on this than on my iMac. And based on the printouts from the iMac, its screen matches the printout better. So I'll need to work on this eventually.
I don't do online gaming, but this TV specs are pretty good for that - better than most TVs I've checked, though I'm sure many monitors are better. I know monitors have some advantages - at least some of them. But I don't think those advantages, for my typical usage case, would be worth the considerable price difference, especially when it would almost certainly be smaller as well.
A curved screen would minimize some issues for me (it is notably further away at the corners) but I don't know if any curve enough to really matter that much and I suspect curved screens may have more issues.
But I still wish there was a way to plug in a TV cable box to the TV and have it show the TV show inside a window like any other app on the screen! That would be ideal. True picture in picture could be good (but rare now). But it would have to be in real time (not just an image) and let you set volume so you could only hear the TV or just the computer, or both at once (volume independently set for TV show and computer stuff).
So, now all we need is to have Apple announce at WWDC that they are coming out with a new Mini, using their own chips, and offer their new screen is this big, does all that I want, and is cheap! Oh, wait. Not going to happen from Apple! So, good. My investment should be good for awhile!