I'm currently 29 weeks pregnant and want to either hire or buy a TENS machine. I used one with my first pregnancy but can't remember which one!! I know there are now several different types on the market and wondered what other mums thought of their TENS machines. Some say you only need two pads, others say 4. The one I used first time round had 4 but a separate boost button. This was ok but I felt like a computer terminal with all the wires! Going to the toilet was a bit of a pain as I had to collect all the wires so that nothing fell down! Would appreciate any recommendations that other mums may have. 
MNHQ Update
This is a very old thread, but if you've landed here while on the hunt for similar recommendations, our guide to the best TENS machine has been recently updated. Based on the tried and tested recommendations of Mumsnetters, the page includes a wide range of options including machines for hire. We hope it's helpful! 