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Biometrics finger scanners, and retna (sp) aren't really needed. Be honest with yourself how many people are going to really be trying to access your computer that much. How many people are going to be do anything to your box, at your house. If you think about it, not that many.
While this may be true... it still does have a wow factor to it and people will always ask about it and what it is and how it works. i have one that is in a pcmcia card that slides into my laptop. I liked it just fine for the first year..... problems with it, i noticed if I moistened my hand it would always work but the biggest problem is the heat....