Product review (4 stars): Worked great for four months
Worked great for four months, then the cold-off-heat slide switch suddenly became too hot to touch and subsequently melted rendering the unit inoperative.

UPDATE 8 July 2017: The manufacturer has reached out to me with an offer of a replacement. Hopefully this was a one-time problem and not the result of a design flaw. I will update this review after I have had the replacement for a few months.