Senza is still in trial periods in the US, it's been trialled elsewhere in the world and the UK and Australia have embraced it. From what I can gather the high frequency that it operates at means you don't get the parasthesia that you get with other models that operate at a lower frequency, so no buzzing of the nerves at all. I trialled the senza in November and although I had problems with a faulty lead, I felt it gave me relief. They went ahead with the implant and that didn't go to plan, but, even though I only have the one lead in, I am already noticing that the pain I normally suffer from in my left hip which is referred pain from L2 & L3 is reduced. As Dr Smith says, the pain, oh the pain. I wonder what life would be like to wake up without it!! Lost in space! Dr Smith, I really used to enjoy that show, thanks for the good time memory recall lol.