I'm really enjoying this upgrade from an S9 to the S21.
I prefer the flat screen of the S21 over the curved screen of the S9.
The screen is still beautiful, and the VRR 120Hz looks much smoother than the 60Hz of the S9.
I also like the buttons only on 1 side of the phone.
Transferring Apps and Data was quick and easy via the included cable.
No real learning curve for the new phone. Does have the option to move to gestures if you choose that route.
128 GB works well for me.
Fast & Responsive
Cameras are a real upgrade both the back and selfie.
Cons:
No wall charger. Additional cost getting a fast charger.
No SD card slot. The increased base storage works for me, but it would have been nice to have it.
Screen seems a little less bright, but only a marginal difference.
Finger print scanner is less reliable and takes a little longer than the S9. It works well enough, even with a thick screen protector.