I've swam in both the Michael Phelps XP and the Hydropools Aquatrainer Swim Spa. In my own wet tests, I thought that the Hyropools had a smoother and stronger current. This seems to be counter what I read about propeller systems making better currents.
Was there something wrong with the Michael Phelps unit I swam in? Do I have to swim in the XP Pro unit?
Looking for advice.