I am currently running One UI 6 Beta on my Galaxy A53 5G and The experience is very nice but you will notice some lag while swiping down Notification Panel and while swiping to Home Screen(Navigation Gesture). Other than that, It's working completely fine.
One UI 6 feels like IOS.
It's a big process. If you have a laptop then you can do but keep in mind, your data will be deleted so back it up and when Official update comes out you have to downgrade to One UI 5.1 to install the Official update.