Indeed, IME their reputation is thoroughly deserved. Interesting about the Faraday cage - I'd never thought about it, but having had a look, they do seem well screened. Of course, the screening will only be effective for very local airborne interference, and not if your line is picking up the noise elsewhere along the route. Re unlocking - up to v5, this isn't necessary, and it's a piece of cake on the v6. Well worth it IMHO - I much prefer the v6 interface, menu etc.
To err is human, but to really foul things up requires an algorithm.