I have a polarising experience in the UK. It works 95% of the time and I hardly ever set the cruise speed anymore. So relaxing!
Very occasionally spots a discarded temporary road works speed limit sign that workmen leave behind, but other than that it's nailed on.
Not known any weather dependency with aSLA. Distance control yes, but not aSLA which makes sense as it uses NAV data when road sign info is not available. Maybe the Honda Civic behaves differently