Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Worked great over two winters
Review: On the coldest winter days in NJ, it would keep an area of open water, not thaw the whole birdbath, which is fine. The birds find the spot OK. Near the end of last winter, I had to keep filling the bath more frequently than normal. I discovered that the thermostat was stuck on and the thing was hot and cooking the water, even on a mild day. It sports a 3 year warranty sticker, but is past the Amazon return period, having bought it in Dec 2010. Not sure I will go thru the mfgr's warranty hassle, paying freight both ways and probably getting a measly partial refund for a $30 product.
