Hi, I'm one of those people who desperately wants one of these, but isn't allowed to, for the reasons that a) it's dangerous, b) is expensive, and c) might be bad for muscles/bones/tendons (I have no idea if this is true, but is it a possibility, anyone?).
If anyone could, without being too biased, tell me the risks, problems and whether they're worth it, then it would be greatly helpful.
Thanks
Andrew