How well do they work / support bluetooth standards compared to other brands bluetooth headphones? I'd like to get these for a family member who wants new wireless earbuds, but not if it's as sub-par experience vs buying another brand for Android users
They are sub-par if they aren't embracing the ecosystem. You can't use most of the features, and the lack of multipoint Bluetooth becomes painfully apparent. Also, you tend to get broader codec support with Android-targeted headphones/earbuds.
Consider Beats if you want better cross-platform support while maintaining the same audio characteristics.