Love my TENS machine! I used it from the first contractions until the 2nd stage with all three natural births. I bought one before DS1 was born and it was a great investment. Others have borrowed it from me for either labour or for back pain.

It can be a bit tricky getting the sticky pads on your back in the right place. Do a practise run with your support person before hand and get used to how it works. That will also allow you to get used to the sensation of it.

If you are in and out of the shower/bath, it can be a bit of a pain taking it off and putting it back on. But that can't be helped. I alternated between shower and TENS and found them both useful.