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.