Hi Janni, I had a tens machine for my labor, but not sure what brand it was so I am probably not much help. I could be wrong but I'm guessing they are all much of a muchness... Just make sure that the one you get has a lanyard you can use to hang the button around your neck (I think all the labor ones do anyway).

I was induced and had a posterior baby so my labor was pretty intense to say the least. I found the tens great, it works more as a distraction but being able to push down on the button at least makes you feel like you're doing something to combat the pain. The electrodes can be taken off and put back on, but I probably wouldn't bother trying it out first. The sensation isn't that pleasant and there is no way I could have had it at the intensity I did during labor without being in labor iykwim. When I picked mine up they did show me how to use it with a smaller electorde placed on my arm so I had a good idea of what it would be like.