I have been using it since March 5th and I love it. It's much lighter than my S8+ and the Clear View Samsung case is so much slimmer than the previous models.
So far the battery is really good. With GPS on and streaming media while driving, some instagram and e-mails, I have plenty to spare at night when I reach home.
For the first time I haven't install 3rd party launcher. Being able to reorganise the dock buttons and remove app drawer button is a big plus. Also ability to change the grid number of apps is something I have always use Nova Prime for. Ans of course, I love the fact that I can remap my BIXBY button. It will not allow you to fully kill it, but at list you can map a single press to app of your choice, the double press for BIXBY.
There is also new app exclusive to S10 models, the BIXBY Routines, which is similar to TRIGGER or TASKER just much easier to use. There are still some features that could be improved, but I like the fact that Samsung has finally developed a native automation app.
What else. The camera is really good and the new wide lens is amazing with covering a huge amount of space, making a group photo from a close distance really easy, without cutting off anyone's legs!
Face recognition is lightning fast, I just flip the cover open and the phone is unlocked. I use the finger scanner as well but it's not as fast, as I usually have to press it twice to get the right angle.
Overall really glad I did the upgrade from 8+. Really liking the phone.