I used one for a year on an old Hayward SuperPump 3/4 HP without a problem. I've since replaced my pump and when doing so, upgraded myself to an Intermatic hardwired. The wiring was pretty easy, but then again, I am not cutting off heaters, and other things, just the pump.

So, keep that in mind, if you have a heater, the plug-in one won't do it because I think you want to cut off the heater about 15-20 minutes before the pump. They make SPDT timers to control both, but they are hard-wired

Peace,
j