Okay, I have joined all you mental people and have just bought this. I have 11 days off work in a row in the middle of April so i will start it then - at least that way if it kills me I am near my bed. Also gives me a few weeks to get my fitness up by walking more.
I am really quite scared about it though having read the reviews.....
I have just had a look at the Simplyyours website - they have 2 for about £25, but I don't know how good they are having never needed one before. I'm going for the shock absorber one - bit more expensive, but I reckon I need the extra support!