Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Almost perfect

My wife and I have been using this product for a variety of things and it has been great. When you turn it on, it doesn't take long to heat up which is great. At its highest temperature, the heat setting is just right, hot enough to bring relief without becoming too hot or uncomfortable. The only thing we wish was different is that once it has been on High for a while, it begins to cool down and does not become hot again until its cooled down first. This is a little frustrating if you wanted it to be hot for longer. We have tried turning it off and unplugging it at that stage, waiting a minute or two and then plugging it in again and having it on High but this doesn't seem to make it any faster. It still doesn't reach High again until its cooled down first. Other than that, its wonderful and has been a huge help for sore backs, necks, and other ailments. :-)