I get horrible menstrual cramps, so I am the type who will try anything at least once. I saw these in the drug store and figured why not. Especially since I often use a heating pad to help with cramps. This pad claims to offer heat relief for up to eight hours. I find that it does last quite a while, but towards the end, there is not much heat left. Overall, it provides some heat and relief when you suffer from cramps. If you usually use a traditional heating pad, this is a much easier alternative. I like that on lighter cramping days, I can use this instead of taking any medication. Overall, a great product to have. Effectiveness This self heating pad does provide some relief. I like that it is a medication free way to bring yourself some relief. However, it is not as effective as medication or even a traditional plug in heating pad, but it does offer a degree of comfort and relief that allows you to still be mobile in ways you can't with a plug in heating pad. Ease of Use You open the package, pull of the sticky backing and stick it on. The first few times you use it it may take getting used to exactly where to put it. It also doesn't restick well if you do need to move it.