Instruct: Classify Amazon reviews into positive or negative sentiment
Query: These things work!

I am a serious walker. I have walked 10 miles virtually every day, except Sundays, for over eight years. I figure that I have walked over 25,000 miles during this time. I am 68 years old. An article about exercise and longevity at The New England Journal of Medicine got me started on such an endeavor. Plantar Fascitis (heel pain) has bothered me quite a bit lately. So much so, that I have been contemplating cutting back on my walking. Today, I received my order of these heel protectors. I put one on my left heel and I received immediate pain relief. I will keep you posted on how they work over longer term.