The price is correct. You are asking how they sell it for so much less.All parts are made in china and assembled in the USA. That's how they sell there stuff for so much less. And they get parts soooo cheap, they give a 3 year warranty without even batting an eye. As far as compared to sierra, they are basically the same quality. They work fine, I had a set that the seals failed after a year. And it was cheaper replacing the seals than the shipping costs to have them fix it through the warranty. Not the best products for sea water use, but they do have great reviews on fresh water use.