Natural light comes through giving privacy.
Dimensional stability at room temperature.
Almost unlimited range of colors - transparent to opaque.
Low cost.
Good combination of stiffness and impact strength, toughness, extensibility, high ratio of strength to weight.
Acrylic-PVC alloy with high impact strength available.
Comparatively low heat distortion and softening temperature.
Non-flammability.

Example of how 3 1/2" translucent PVC vertical blind looks like when tilted:


When blind is closed	One-third open	Half open	Back side of the blind