Congratulations Cheryl - great news.
Yes, I have had sustained lower hba1cs for the seven years since pumping. I was in the 8's or 9's with hba1cs prior to pumping (getting to the high 7s with a huge amount of work). I managed to get into the low 6s within two months of pumping, then fell pregnant, then stayed in the 5s for the next year, and gradually came up through the 6s over the next four years. The past two years I've been sitting in the mid 7s, but I haven't been putting in as much effort. Still - very much improved on what I could achieve prior to the pump. The highest hba1c I've had in nearly 8 years has been 8.1%, and that was a one off (and also coincided with IVF treatment and Christmas). So I'm pretty happy with it. Everyone is different but it has been a very positive step for me.
Hope it continues to go really well for you.