Hi Charlotte
Before pump Hba1c was 8.something (think it was 8.3/4) and 3 months after was 6.9. Has since levelled off in mid 7's. Some people get really good results but believe the avarage drop in HbA1c is between 0.5-1%
For me the main bonus wasnt the improvement in HbA1c it was the reduction in number and severity of hypos, and I love the freedom that comes with a pump. If theres anything you want to ask shout up or you can always send me a pm.
Good luck and happy pumping!