I used the Labour TENS for a few hours and found it really helped without giving any “high” side effects like the gas (which I gave a go too, just out of curiosity).  I preferred the TENS to the gas!

However, in my case, after about 6 hours I was only 1.5cm dilated and my cervix was still thick, so I opted for an epidural.  Had I dilated sufficiently I think I could have handled the delivery with just the TENS machine.

I definitely recommend the Labour TENS machine!