If you have previously recommended this thread, you should see a tick / check mark on the recommend button. Click the tick to undo the recommendation (the tick may appear to change to a cross as you do this.) If you added a comment with your recommendation, you will need to delete that from your facebook wall separately.
Ive just hired one. I did loads of research into which was the most highly recommended one and then where to get it from. The Elle tens seemed to get a lot of positive reviews and is also the brand recommended by the NCT. I hired from pregnancytens.co.uk. They have a sale on hire of elle tens at the moment and it was £21.85. Free first class delivery or £5 for next day express delivery. I didnt opt for that but it arrived the next day anyway - great service. You get 7 weeks hire and two more free weeks if you go overdue. Havent tried it yet but it looks good quality and comes with free practice sticky pads.