People on pumps: give me your opinions

I’m a T1 for about 20 years now, in my 30s. Excellent blood sugar control, with a1c usually between 5.8 and 6.3. I use pens currently.

My biggest concern about switching to a pump is how active I am; I run around 50km/30mi a week. Since I have good control, I haven’t seen a need to switch, though some of the recent advancements of combining CGM with pumps does interest me.

What are you currently using and what general opinions do you have? For those of you who are quite active, have you run into any problems?