It was a breeze to transfer my S8 information to the S21. I use the fingerprint option a lot and it is very sensitive and quick. I am loving the phone and I just got it March 5th and it is easy to use. One drawback is the screen should be soil and scratch resistant since it doesn't have a screen protector. I am still learning the ability of the phone.
Runs great but the Samsung Smart Switch app caused some hiccups. If you have a static IP address set up for example, it will transfer that to your new phone and then you'll have connection issues if both phones connect to the same gateway.