Back in the mid-70s, Australia had a 'metric day' when, not only did the metric system become the standard, but selling tape measures, scales, etc in imperial was not allowed. My father held onto his old ones for a while, but even he converted over within a short time. Coming over to the UK, I found myself converting from metric for a while, but I'm now pretty happy in both systems. Though I still find dividing stuff by 16, 14, 8, etc pretty frustrating, even if it is useful for keeping my mental arithmetic up to speed. I'm just glad I never had to do physics with the imperial system.