I never thought I'd buy a push mower due to my bad back.  I have a townhouse so don't have a big yard, but its a decent size for a townhouse.  I had a gas mower for many years and it finally gave out so I decided to get a push mower instead mainly b/c I was tired of having to go fill up a gas jug every few weeks, plus for the size of my yard, a gas mower is a tad overkill.