Are Privacy Screen Protectors Good?

So... after watching the video, do leave your comments below on what you think about privacy cell phone screen protectors!

Do you like it?

I personally think that it is pretty tight technology, but I do not like it... after all, it's not like I view 'r-rated' pictures on my phone in public. So it's pretty useless to me, and just makes my dear hand phone screen look very dark.