Got mine yesterday on a deal that I just couldn't refuse. Tmobile had a deal where if you add a line you get one of these for free. So I added a line to my account (had been thinking of doing that anyway) and now I have a $700 5G phone for free.
Here are some thoughts after using it for a day;
I do like it, having come from a Pixel 3a and many phones prior to that. It's a phone with great reception, and good call quality. It's snappy, has an awful lot of customization possibilities (what Samsung doesn't). I do not regret switching from the Pixel 3a which I actually loved, but now I have a 5G phone with wireless charging capability.
Do I have any criticisms? Yes...I don't feel the AMOLED screen is all it's cracked up to be. To me, it seems a bit washed out, looking a bit more like an LCD screen to me (not sure why). I have it set to vivid and when I set it to normal, it looks even worse. I've seen much better. Also, I disabled the Samsung keyboard which I thought was absolutely awful and am using the Google gboard instead. I'd highly recommend this to anyone with a Samsung phone. Same for Bixby, but I am sure this is nothing new that anyone is hearing here. I've also disabled Samsung Daily as I see it as an unnecessary bunch of bloatware.
So far, the battery seems to last more than a day, but I did lower the refresh rate to 60 as I really can't tell any difference between that and 120. Though admittedly I did not want a phone to play video games on, so I probably am not appreciating the potential difference.
The in screen fingerprint sensor seems to be working great, even a lot better than I had anticipated. So far in 2 days of heavy use, I have only had it miss maybe 2 or 3 times. I have not tried facial recognition, though I do like the fact that I can choose either method. Coming from the Pixel whose fingerprint sensor is on the back, I did have some reservations as the one on the Pixel is wonderful. But I must say that at this point so far, I am preferring the Samsung one in the display as it is easier and quicker to access.
I suppose 5G will still take some time and get even better, but I am getting download speeds over twice what I was getting on 4G. I'm happy with this.
By the way, my T-Mobile branded one did come with the screen protector (or at lease something that looks like it can be left on). Not sure if it's meant to but it seems more permanent than the normal plastic they put on new phones.
All in all, a good experience and I highly recommend this phone to anyone contemplating it.