Which TENS machine does anyone recommend?

[WinkyWinkola]

I'm 34 weeks now and need to sort out a few things.

I'm going to buy a TENS rather than hire this time.

Are they all much of a muchness or are there any that are particularly good?

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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!

Make sure it has a boost button for contractions. I used Elle TENS. No harm looking at ebay if you plan to buy.

Elle TENS here too. The boost button is what you need.

Elle tens here too, got me to transition with no other pain relief twice.

I used Femme TENS. I thought it worked well, and it has a boost button. I got mine off ebay and just bought new pads for it.