Sounds simple but like most things its never that easy. Electrical wiring and connections introduce points of failure which can occur without warning. A marginal battery can suddenly become an issue. Simple mechanical driven pumps are very reliable and usually give some indication of problems before failing. I guess what I'm saying is I would prefer something that has a gradual failure probability to something that has more chances of an immediate and unforseen failure. That being said, most things manufactured today are pretty reliable if properly installed and maintained.