I got the S10 (regular, not Plus) a couple weeks ago after paying off the last two payments for my previous S8+. I only pay $2 more a month and I wanted a new phone because reasons, yay.
I went with the regular S10 and not Plus, even though I've had the 7 and 8 Plus models, because the 10+ was just a bit too big and the regular S10's screen is about the same as my S8+ overall anyway. I like the bigger storage and RAM over the S8, that's definitely nice. Although my S8+ still performed fine and I never experienced any slowness or choppiness with it.
So far I think the fingerprint reader on the S8+ was way better than the S10. I didn't mind it on the back, but it just read my finger a lot more accurately than the S10's does. It only validates my thumb about 75% of the time, and I made sure to choose different positions when I recorded the thumbprint. The S8+ got it right like 90% of the time or more. Although the face recognition is quite a bit better on the S10; it's noticeably faster. For some reason I can't use the phone while wearing my leather driving gloves when I could with the S8. That's kinda weird. Well, OCCASIONALLY I get it to pick up my thumb presses, but pretty much not. I wonder what the reason is for that, something in the screen construction I guess?
I still want to use Bixby more often because I think it can be handy if used to its abilities but haven't gotten into that much. Just tried it creating a text message by voice (good for driving) and having it set DND on.
I think my S8+ had way better battery life but I also kept mobile data off on that almost all the time. When I was at Verizon I mentioned that and they advised me to keep it on so I have, but it must be eating the battery. Otherwise my settings have remained the same (wifi/bluetooth on, GPS off). I just looked it up; the S8+ actually had a 3500 mAh battery and the S10 has a 3400 mAh. Bah.
Overall I like it. I kinda thought I'd be getting those wireless earbuds but they didn't come with my phone, just the wired ones. I have Pamu Scroll ones but am kinda "meh" about them so far. No biggie though.