I have a connective tissue disease, and I got this on a whim because I figured I had nothing to lose since I could return it if it was snake oil. Most of my pain is in my joints, but it pops up randomly like a pinball machine. One minute I'm fine, then out of nowhere my elbow aches, or my thumb, or my knees. You get the picture. The first few times I used it, I was convinced that my sore joints had just felt better coincidentally shortly after I'd used the device. The more I used it, the better I felt. I now use it daily in the mornings while I wait for all of my medication to kick in. I don't take the storage case when I travel, because the battery on this thing is insane. It comes with a nice sleeve that is store it in, and I just keep it in my purse.