I purchased this product because I had very noticeable dashboard glare and I was led to believe that this filter would reduce it and it did. I would recommend it to other users experiencing similar issues.
Easy to install, works perfectly, only one concern: glued to the dashcam with just that thin line of glue, will it resist jolts and impacts (for example when I take it to the car wash); I would have preferred something in the style of a camera lens that can be screwed onto the body of the dashcam.