It arrived quickly & its been running for 2 weeks ,off & on in "manual' mode. The 3rd speed seems to match the volume of the old pump, even when the Polaris boost pump is running. So I do not use the 4th speed. I do wish the speed buttons evenly changed the speeds from hi to low or low to hi, and not jump around. IT is very confusing to tell what button is for what speed. Also I wish the control box could be rotated for easy viewing. Some hlgh end makers have this feature.