I installed this on
Opel Insignia

Review
Device work day or night, rain or shine. No false trigger. Headway alert helps to judge distance to keep from front vehicle as speed increases, allowing for ample e-braking distance. Speed limit alert highlight changes from 1 speed limit to another. Can detect LED speed limit signs in KPE tunnel.

What I like
A system that can keep an eye out when there's distraction or driver lapses. Encourages signalling during lane change to avoid triggering the alert.