They provide relief each & every time I use them
My situation is a little unusual with ongoing muscle spasms of 25 years duration, tendinitis, & massive scar tissue. I have been using them very frequently for the last 5 years. Quite frankly, I don't know where I would be without them. I don't use them for any less than 30 minutes at a time. I may use them more than once a day. They provide relief each & every time I use them. I have recommended them to friends who have also purchased them based on "my word" & would concur that they are very effective. I use 3 different versions of the lumen pads.