i have been D for 30 yrs and have been on my pump(s) for the past 18 or so yrs. it has made an incredible diference in my life and i would never consider going back to MDI (i have tried to take what is called a “pump vacation.,” where i have gone back to MDI for a couple of weeks, and it was just too complicated to bother)
on MDI i was giving myself about 10 shots a day. i was using Lente, NPH and R, and then, ultimately Humolog for meals instead of R.(which was wonderful) however, i did not like being on long acting insulin as i had to eat according to the peaks; i had a lot of highs and lows, and could not reel it in to keep me as stable as i have been on the pump. also, i did not care for having to take so many shots, mixing insulin in my syringes, etc.
also, i did not have the same tight control over my basal profile as i do on the pump. that is one of the features that i LOVE about the pump. i also like that i only change my pump every 2 days, so no needles except the rare need for a correction. i love that i can control temp basals when i need to, i love that i can do lowered or higher basals for exercise or illness. i love how easy it is to change my basal profiles with absolute ease when needed. i can set my ICRs for the entire day, and set them for every possible hour of each day from 12am to 12am. i also love that i can disconnect whenever i feel like it.
there are many more reasons, i am certain, but cannot think of them right now. but i hope you get the gist of my preference and why. and, btw, i have never had 1 infection since i have been on the pump. YDMV, but for me, as long as i keep everything sterile i have been ok. the only problem i have ever had has been a pump malfunction or a “bad” infusion site. but both of these problems are so easy to correct that it doesnt bother me in the least.
hope this help some. and btw (again), on MDI my A1c was in the 8%. on the pump i am down to 4.9% (of course my swimming has been a strong contributor for that low # )