[Gordy Weigel]

They had problems with the orginal Wonder Ducks taking on water thru the seals, this was at least 5 yrs ago. For a small fee, you could get those replaced with the updated verison.
There are now several different models of Wonder Duck. The "Tornado', produces the most water action. The Wonder Duck's are well made products, that do give nice water action. I have used them for years and have found them to be effective and easy to use and maintain. Very good warranty on the product.