We installed these in a bay window that has never had shades of any type (26 yrs!)  One annoyance was that the best configuration of the room is to have the TV directly opposite that window.  During the daytime, the bright reflection of the light coming in made it difficult to watch the screen.
We decided to try these darkening shades (vs. the semi-transparent option) and see what happened. The difference is remarkable.  They are truly 'darkening' and the lack of light in the room during the daytime is almost alarming.  They do exactly what they were supposed to do and the easy installation and cordless feature make them that much better.