Used Breast Pump-Advice

BabyC2012

A coworker of mine has been very generously giving me tons of her old maternity clothing as she is done having children.  Today she offered me her Medela In Style pump with carrying case for $75.  She bought it three years ago and used it for two children.  I would need to get new tubing, but that doesn't seem too expensive.  I looked it up and saw that it retails for $299.00 on Babies R Us, but I don't know anything about pumps! Do they tend to last a long time? Is it a smart investment to get a used one expecting a long life with it? Any advice would be great!