Rotavirus vaccination was only introduced to the schedule when my daughter came along. I jumped at it.
Both my boys did not have the vaccination as it was not on the schedule at the time and to be honest, I had not actually heard about Rotavirus before.
I was having a conversation with my SIL in Adelaide and her daughter had come down with Rotavirus. I remember her telling me about it as she ended up taking her to Emergency and on the way her daughter had a convulsion in the car.

I asked her what it was exactly. A few months later, both my boys were struck down with it together. It was horrid, worse than normal Gastro and lasted over 5days with many trips to the GP to get checked out in-between. I felt powerless to help them and it was just a matter of seeing it through with lots of hugs, washing and keeping an eye out for dehydration.

I didn't know you could be vaccinated against it until my SIL told me and wished I knew more about back then as I would have paid for it by myself if I knew how awful it was.

She did not have any reaction to the vaccination.

That's my experience with it.