Yes I used one, that's the only pain relief I used.
I highly recommend getting one. It was fantastic to have something to 'do'. The one I used had a hand held button that I pressed down on during contractions, good for something to focus on.
At the end I didn't think it was having any effect & I had it up to it's highest setting. But once DS was born, somehow I accidently set it off & nearly went through the roof! So it obviously was taking away some of the pain lol.