I am actually answering as the "giver" of MDI's rather than the recipient and here are some of the reasons we have chosen to remain on shots. My son is 10 and a half, was dxed right before his third birthday. He takes 5 shots a day-- 7 am 3 units novolog 6 1/2 Levemir lunch 3 novolog dinner 3 novolog 7-8 pm 61/2 levemir. His fast acting is sliding scale.
When my son was diagnosed seven years ago at the age of two, our endo was hesitant about begninnng pump therapy. He has always had great A1C's and has been very compliant on his shots. He has also expressed very little discomfort from his shots. As time went on, we noticed that he was very sensitive to his injections spots- he would get these knots on his skin and was pretty sensitive (sub q). He is also very very lean. So that combination made me fearful that his pump would cause reactions. When Cameron was 6 we switched endos. Our new endo is also of slender build and diabetic. We discussed Cameron's sensitivity and together realized that Cameron may have a limited "pumping" career. I felt like saving his stomach or other pump sites for a time in his life (college) he was really going to need flexibility and freedom was the way to go.
I am sure this will cause a stir, but I really wanted him to be consciousness of what he was eating and how it would affect him and his BS. I know that seems harsh - but in my head, he was going to need to own the choices he made about his diet and i wanted him to learn to eat healthy and make good life choices. I did not want him to bolus to cover putting whatever he wanted in his body.
Finally, he is a very very active kid and swims from April to September. His rate of activity in the summer is so great- that we sometimes do not do our lunch shot and he is fine. His AICs are great and right now this is what works for him. I also have always said that this is a decision that is his to make and if he wants to pump.... we will definitely look in to it.