One of the ads I saw claimed complete blocking at 35 degree angles to each side. Here's a review that claims the same:
Privacy Filter Screen Protector for Motorola Droid RAZR XT910 | motorola razr xt910
Unless the film is polarized, I suspect the results the reviewers reported will be the same for you.
Here's a review from one of our own here, for the BodyGuardz Privacy ScreenGuardz:
http://www.droidforums.net/forum/droid-x-accessories/142879-bodyguardz-privacy-screnngaurdz.html
Here's a video demoing it and it appears to do what it's advertized to...
[video=youtube;Xg3zt4Nl700]http://www.youtube.com/watch?v=Xg3zt4Nl700&feature=player_embedded[/video]
And here's the link to the manufacturer...
Motorola Droid Razr Screen Protectors by BodyGuardz
Good luck.
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