Is purchasing a 2000 Subaru Legacy GT Limited worth it?

this is what the guy selling posted ''2000 Subaru Legacy GT limited sedan with 189,000 moles. It is all wheel drive, fully loaded with leather seats in great condition, non-leaky sunroof, cd player/cassette. The car has the 2.5 4cyl With automatic transmission. '' so my question is it good on gas mileage also will it break down quick and are they reliable and are the parts cheap?