They worked for me until I had to be monitored. Which meant I couldn't use it anymore. At that stage I was abt 5cm. Ended up with a bit of gas & water injections. I would have use tens for longer if I could.
Did they say why you couldn't use it during monitoring? I'm going for a VBAC and will have a lot (potentially continuous) monitoring. So it will throw my plans if I can't use the TENS! Though I could still use it at home of course before going to hospy.

Thanks for all the replies girls - am feeling very positive about this now!