I had my jab this afternoon so it is a tad too early to comment on any side effects.
Like you, I had mine at my local pharmacy. I think too many people were missing out on their jabs so the idea is to make it as easy to get as possible. Unfortunately, the consequence of providing the pharmacist with the stabbing opportunities is that doctors' surgeries are providing less clinics.
My pharmacist explained to me that this years vaccination provides protection (in two weeks' time) for the same three strains as last year (Singapore, Colorado and one other) as well as the strain that caught everyone out.
As I didn't react last year, I hope I have less than a 1 in 4 chance of "flu like symptoms" this year, especially as I am away for business tomorrow.
He also mentioned something about "under 65s" getting this dose. As that includes me, I didn't ask what the difference is for more mature patients.
This year, I followed the recommendation to put an "icepack" on it for 5 to 10 minutes as soon as I got home. This is supposed to reduce any inflammation and stop the achy arm feeling. It feels fine at the moment (2 hours later).