Totally blacks out the screen when tilted 90 degrees. Not a common problem, but also not an issue with an Apple Watch or iPhone. Curious why Garmin and Wahoo seem to use a different setup. Although the digital displays in my car are also the same, totally invisible when the glasses are 90 degrees to them.No problem on my GFs 510, or my 810.
I think my biggest issue with using polarized lenses while driving is that they bring out the glue pattern in every piece of car glass, tinted windows or not. Gets annoying seeing all the blobs in everyone's windows.