M9 Average Speed cameras

I’ve been driving the route a couple of times a week since the start back in October. I’m occasionally passed by cars doing 50mph+ (I usually do steady 45mph) so I wonder if they are actually working, probably best not to take the chance though. If you’re northbound and taking the Halbeath off-slip, it’s possible to speed up between the 2nd last set of cameras and the off-slip - this is the stretch patrolled by the unmarked cars, apparently, but it isn’t very long so you’d be unlucky to get nabbed there. Anyone else been done since the first week ■■
Don’t agree that traffic moves better - usually there’s a pair of cars doing 30mph blocking both lanes with 500m clear space ahead and a tailback.