Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Just a junk windmill.
Review: I have had 4 of these in my yard for years, and it does nothing for the burrowing critters. The bearings wear out in just a few months. It use to be you could call the company and they would replace the bearings for free now they want to charge some ridiculous amount. The only reason I still have them in my yard is to see the wind direction. Certainly not worth the money for the short lifespan of the bearings, the hassle of replacing them, and they don't chase away gophers,chipmunks, burrowing critters, etc.
