I recently had my annual hi-dose flu shot. The shot was given in my left arm in the area between my deltoid muscle and shoulder. The shot was quick and painless. About two hours after the shot, my arm became sore and swollen like it did after prior flu shots. I could feel the soreness each time I raised my arm. The soreness and swelling lasted for about two days and then subsided. I would say that the soreness and swelling in my arm was at least equal to or greater than the last tetanus shot that I received. In my view, it is better to have a sore and swollen arm for two days rather than being incapacitated with the flu for several days.
That aside, I feel that it is very important to my well being to get a flu shot each year. I have had 20 flu shots (including the H1N1) over the past 19 years and have never had the flu even after being exposed to people who did have it. I would strongly suggest that anyone who meets the medical criteria for receiving a flu shot actually get one.