Using 3/8" silicon tubing on 1/2" hoses. Leakfree since over three months. No tedencies to creep off the hose or bust.
Don´t know if tygon gets stiffer or crackes over time if exposed to daylight or anything else like that, but I wouldn´t worry. You will most likely replace the tubing during some upgrade before it becomes a problem.
regards
Mikael S.