For my hatchback (Prius '14) they are not strict enough. If you tilt the window, don't look at it directly through the shadow when it's moving the most. At an angle, the shift is much less, so I've only seen cars with their headlights on at night. Otherwise I saw almost nothing. Other than that, it seems really well made. The suction cups hold well and are easy to assemble. I have given it to a friend to try on her car with a more vertical window but have not had any feedback from her yet.
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