I literally just had my Boston Scientific SCS put in two hours ago. It was so easy. The only discomfort at all is my upper back where the leads were put in and that's not much at all. Although both the PM Doc and Rep for BS said I wouldn't notice much for 48 hours, I actually have a little relief for my sciatica. It has lowered the intense sharp pain. It isn't like a TENS unit at all. There is some tingling, but it is a soothing mellow feeling. No electrical shock. If what I have now at this stage even gets better, I am definitely going to be happy. I have had pain since 1991 where I broke my back during the Gulf War. I was supposed to have been paralyzed. My surgery was a complete failure and pain has been worse since then in 2007. I will update as time goes.