I've read a lot about this wonder-tool, mostly good, and I think it sounds like a marvellous thing. What is the difference between getting one for £30/£40 and one for a fiver? Are they the same thing? One the one hand, I don't see the point in paying ££££££ for something that you can get for £, but on the other hand, getting crap is a waste of time and money. I do not know enough to make a decisions! Anyone had experience of both cheap and expensive or has any idea?