I used one and hated it. I am very sensitive to touch and 'foreign feelings' in my body though, if that make sense? Which is a very big part of why I had drug free labours too. As much as I don't enjoy the pain in labour, it is natural and I can cope with it.

I tried the TENS in early labour but I found it very electrical and stingy and I couldn't get into the vibe with it. The birth pool is a million times better in my opinion. Just run the bath and hop in