Had the hat-trick of Pfizer doses now (as of Sunday before last). Dose 1 in July, dose 2 in August, dose 3 10 days ago. All at a Vic Gov state vax hub.
Dose 1 caused confusion as I was invited to get the vaccine before I was eligible by age (I'd registered and was sent an invitation to make an appointment), but I had the booking so they just let me go (was told apparently nobody bothered checking the details, so although I'd provided all the correct details, they shouldn't have let me book, so it was their mistake). Anyway I did the same for OH (1 year younger) and all was well (there was plenty of vaccination capacity at the time luckily).
No effects at all from dose 1, dose 2 knocked me over for 48 hours, dose 3 was even worse, knocked out for 72 hours, felt horrible (like a really bad cold but without blocked sinuses, except dose 3 where I was a bit congested) - felt hot, shaky, dizzy, joint pain and a terrible headache. Spent three days full of codeine, ibuprofen and pseudoephedrine, which took the edge off all the symptoms, then felt fine. The side effects for dose three actually took longer to start than the second too - dose 2 was a PM shot, was feeling bad by bedtime. Dose 3 was a morning shot and I still felt fine at bedtime, but woke up (or rather sweated myself awake) with all the symptoms.
Vaccination certificate (both domestic and international) was available updated with the third dose immediately, which was good. Anyway, gotta do what we've gotta do, so no complaints.