I got my booster shot yesterday. It was different from my other two in several ways. My first two were AZ shots at my local pharmacy: this was Pfizer at the Toronto Metro Convention Center. Getting it at a pharmacy is very low key: at the Center it was a process. That said, it was a well organized and fast process. I went from entering the building to sitting in the waiting area in minutes. There are lots of signs and assistance everywhere and well done.
Like my other two vaccines the side effects occurred. I slept a lot. With this one, my arm was sore longer. Also I had flu like chills at one point. Overall though it was fairly mild.
The pandemic is hard. Get your vaccine booster when you are eligible. Get a flu shot too.