I have only very minor irritaion , and usually toward the end of my insulin supply . Goes away when I switch infusion sites . No problems with insulin flow . Can even tie line in a knot and flow in not interrupted .
Wife was one who suggested the pump . It has greatly improved our quality of life . Don't have to calculate the NPH anymore as I now take only Humalog with the pump . Much easier to calculate using just one type of insulin .