Pump Upgrades? help please!

I saw a  post about this a while ago, but now I cant find it, so I'll start a new one.. Are pump upgrades really necessary? because I'm eligible for a new one next month but it will be my first chance for an upgrade. Do I really need a new one? Are you supposed to get one when it is possible or is it only if you want one? I really have grown to love my Minimed but I'm nervous that if I keep it too long, it may start getting glitches or something..