I've gotten 4 and no issues, as did my wife, mom, dad, sister, brother. I did get covid on a flight down to FL to see the 24h of Sebring but just had one day of chills and no other symptoms. For unrelated reasons I recently had a chest xray and ekg and both were clear/normal.
There is another booster available and as long as insurance is covering it I'll probably get it again. A close friend just came down with covid this week (I guess were in a small spike in Aug), and he was down for the count for a few days. He got 4 shots but no recent booster.