I agree with Donna Jean. I have the Designer I, II and SE/LE machines and they don't require as much attention as some other machines do. However, I do clean my machines regularly and try to keep all lint out of the bobbin case too. I rotate the machines every year for service but haven't had a moments problems so far and I sew all the time on all of my machines. I can embroider on two of the machines while I quilt on the other.