I had a TENS machine prior to having the SCS implanted. The sensations are more like pins and needles from the SCS compared to the TENS. I did find that the TENS wasnt as good as the SCS either. The TENS aggravated the pain in my legs compared to the stim helping the pain. I certainly miss my stim now because of the battery but hopefully I will be up and running again on TUES/WED.............