If you really want a mower to last long, Brand is not important. A industrial quality mower is far better. The kind used by Cities, parks, and landscape companies. Industrial grade mowers far outlast "homeowner grade" mowers. They are costly though. ...
check your local classifieds; check with a dealer who takes trade-ins. Check with an on-line site such as Craigslist or the auction sites for completed sales.
If you are really going to mow 4 acres regularly, choose the commercial mower. They are made for mowing lots of land and for many more hours of usage. They cost more but last a very very long time with regularly scheduled maintenance of engine and eq...