I was looking at purchasing a new Stihl BR 420C Backpack Blower for $400. I was approached by a person selling a 4-5 year old Stihl Blower/Sprayer SR420 Backpack for $175. The used one has only ben used lightly. I don't need to do a lot of blowing, but prefer the backpack to move oak leaves. Any suggestions one way or another?