The S21 5G is a good phone that has most of the features that I was looking for in a phone. It has a fast processor and enough memory to meet my needs. It is large and has a very good camera and display. Battery life is great and charges quickly. On the down side, it does not include an audio 3.5mm port for your headphones but an adapter to for converting existing headphone plug to USB-C are available and inexpensive. Additionally, be careful to make sure you get the appropriate amount of memory with your phone as an SD card reader is not available. My final complaint is that it does not come with a charger.
The phone itself works great. I upgraded from an S9, and the biggest improvement is the camera. I'm ambivalent about the change in fingerprint scanner; it's more convenient on the S21, but more finicky with a screen protector. One major downside compared to the S9 is the loss of storage expansion via micro SD card.