I got chipped last Friday. The shot itself was as close to painless as you can get. After watching the important people get vaccinated on television, and seeing the needle go "to the bone", I was expecting more. Six hours after being vaccinated, the injection site shoulder was mildly painful. The following day, moving my arm upward to shoulder height or more, elevated the pain level to moderate. It took another 24 hrs for the discomfort to subside. There were no other side effects. Beats getting even a mild case of Covid-19.