I had one of these Rule 500 auto sensing pumps in my old boat (smallish outboard runabout). It seemed to be reliable but I also kept a clean bilge so no trouble with debris clogging it. You can hear it run every 2 minutes looking for resistance on the impeller. I used a switch as well so I could turn it completely off or force it to run on demand by toggling the switch, but it will still auto-shut off if the impeller drops below its resistance threshold.
For the size of our Skiers I don't know that I'd go that small - personally I like the Rule-mate 1500 with internal float switch.
