I have run a small spectra unit for 15 years. Replaced a $150 pump head in all that time. Operation can't get much easier. Push the button x times to make x gallons and walk away. Has a manual override if the control cct fails. The Clarke pump setup makes them pretty energy efficient as well. Overall been very happy with it. Do a lot of long range fishing away from ports so reliability has been a major thing for me.
I don't know the rainmaker product.