I've only had the Ameo Powerbreather Wave Edition for less than two weeks and used it so far only for swimming against two powerful swim jets in my plunge pool at home. Brilliant, I don't get mouthfuls of water now from the jets when I do breastroke and can concentrate on technique drills for both breast and freestyle. I am very impressed. Next progression is to the 50m pool with tumble turns and then the open water. I am looking forward to both!!