I used a TENS and found it invaluable. It definitely took the edge off the pain and I think I would have asked for more pain relief if I hadn't been using it. As it was I got thru' labour and birth using TENS and a bit of gas. I know it was working because I accidentally turned the dial down for one of my contractions, and boy did I feel it!! It was soooo much worse than with the TENS turned up properly!!