i think they're a bit crap to be honest, they are nice and thick steel and then the door is secured by a thin hasp and a padlock that looks like it could be sheared off in seconds, what's the point??! plus they're very expensive!
EDIT: i was thinking about the TriMetals bike garage, which is similar - the BikeSafe one looks a lot better
but jeeeesus they're nearly 2 grand!