My only negative critique is that getting ahold of the electrical testing equipment (resistance/ohmeter testing) was very difficult. Unless you know the right person, you will likely have to rent or purchase them (which is pricey). Even the professional electrician installing a variety of items in my home did not have all the equipment necessary to do the final testing. I had to rent the meter required to send 1,000 volts through the system. The floor works great so far, but that testing is not easily done by a homeowner. Nonetheless, you require it for the warrantee, indicating that you have likely had difficulty with the product in the past.