Written on: 30/08/2010
Had mine (470) for 7 years following 2 or 3 other ones from different makes which were unreliable. It has gone on for 7 years and still going fine without a single problem except that the self-drive cable stretched and needed adjustment. Reading the other reviews there is clearly a quality control problem as they're either unltra-reliable from day one or utterly unreliable form day one.
Personally, I'm moving to the Channel Islands and I;ve bought another one from B&Q there and will leave this one for the new owner as it owes me nothing after 7 years
Would recommend all but the Friday afternoon versions.