I had very terrible luck with the original Engel aerator pumps. They were very cheaply made. Bad switchs, bad power ports, bad cords, loud and bad motors.
It was very hard to spend $50 on the new rechargeable Engel pump but I gave it a try. They definitely stepped it up with this pump. Very well built. It is very quiet, sometimes you have to check to make sure it is still running. It has heavier cords for charging and for running off of 12v power in the boat. Was able to run on high for a 10hr day keeping shinners while just running on the rechargeable battery. Only 1 season on it so far but would definitely recommend this pump so far.