Definitely worth a try.

I have to say I was a bit of a skeptic about TENS but a couple of weeks back I had a client who did a 30 hour posterior labour with nothing but TENS and I am now a believer

Some women find them irritating with all the wires hanging off them but it didn't bother this mama at all. She just sat on her birthball with her TENS and breathed and breathed and she did great.