Great heat, but dies after 6-10 weeks - so plan on buying it every month or two!!
I have significant neck trauma, so was pleased to find this product provides excellent heat.  I can wear it around the house attached to a battery, giving me mobility and heat at the same time.  This is awesome.  What is not awesome is the product's life span.  The first one lasted 10 weeks then died, so I ordered another.  The second one only lasted 6 weeks before it died.  So if you are willing to treat this as a disposable commodity, it works great.  Unfortunately, it's not on prime anymore, so if I decide to order a third one (!!!) it won't arrive for 3 weeks.
Rating: 3 stars