Brain transplants

My vending machine has had 3 brain transplants in the brief 6 months I have known it.  The first brain was slow and friendly.  The machine was responsive & it's default screen streamed "Enjoy a nice snack!" again and again.  The 2nd brain was snappy and slick and dirty, literally the motherboard was filthy.  It's default message was "Enjoy a pack.  Always low prices.  Machine takes dollar bills gives change after."  It was a vice-supporting, and very informative brain.  This 3rd brain I am still getting to know.  Let's hope this one sticks.