These are my personal thoughts that I have experienced with the new One UI update.
Battery Life - I've noticed a change in the battery life of my Note 9 ever since I updated to the new One UI.. and that change is that the battery life has improved. Now don't get me wrong the battery life has been nothing but impressive. But now it's even better. There are some days where I don't really use my phone.. just sits there.. before the update lets say the battery was at 98%.. it would drop about 10-14% by the end of the day with limited usage. Now it only drops about 3-6%.. that's impressive.
Design - I thought I wouldn't like it the change.. but I really do. Even the clock being moved to the far left is something I like.
Speed - Apps seem to load quicker.
No More Auto-Hide for the Nav Bar - I always liked the fact that the Navigation Bar would auto-hide in all apps, plus it was transparent. Now in apps like Coloring and Chrome it's always there and its white. So you can accidentally hit a button when you are using the Coloring App.. which is highly annoying
Split-screen Control was hard to find: I had to use good ol' Google to help me find out how to use split screen in Android Pie... it's stupid how you now have to click on the apps icon to find it. Not a good move IMHO.
As you can tell I am not a professional reviewer.. lol..
That's impossible to do. Some like the new icons. What would be perfect would be to offer the previous icons as an icon pack in the Themes store. Or improve the existing ones. Some look way too cartoonish (even though I do enjoy good cartoons), and the lack of color is also something disappointing. Adding gradients isn't hard
Those that I hate the most: Contacts, Gallery, Calendar, Camera, Settings, Samsung Notes, Reminder, Smart Switch and the upcoming Samsung Music icon (I saw it and it's horrible)
For reference, I have enclosed images of the old and new Gallery icons. The old one not only looked much better, it was also much less dull-looking thanks to a gradient
The new icons suck. I downloaded an alternate set. Very disappointing. Support was not very helpful. The old package should be made available. This is minor but still indicative of how stupid Samsung management has become.
i thought one ui was solid at first especially because the wait was so long but its actual trash. So many polished naive features broken or just removed. All multiscreen streamlined features are either gone or broken. Being unable to rotate split screen windows, the lose of split screen app selection; replaced by a random generated application picker.
All customization plugins excluding One handed plus are broken.
Camera settings grouped together poorly and setting reorganized in a concealed manner.
This update felt to Apple like, (These are our changes deal with it, remove customization and leaving customers with the same phone user to user)