Rohos Logon Key is a small program that runs on your Mac to lock your computer to prevent unauthorized use. The Rohos Key utilizes any USB port to secure your Mac thus providing hardware support to lock your laptop.
The security benefits are:
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Automatically locking your Mac screen when the USB Key is unplugged
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Two-factor authentication: PIN code + USB Key
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Unlocking your Mac with a USB token is fully automatic and fast!
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Regular password based login may be prohibited with “Allow to log in only by using USB Key” option

Rohos Logon Key will use the on-board serial number from any USB device to lock the Mac with a password that you define. No data is stored on the USB key so you can use any USB device mac compatible on not mac compatible.
Rohos Logon Key works with the following USB devices:

I have tested Rohos Logon Key with the USB flash and YubiKey's and worked very well. Once Rohos Logon Key is enabled there are 5 actions that the removal of the USB key can be set to:
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Lock the desktop
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Log out
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Sleep
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Shut Down
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No Action
Once you reinsert the USB key, Rohos Logon Key will ask for a password to logon to your Mac. That's it; very simple lock and unlock. If you do forget the password and make 3 wrong attempts to enter PIN, the USB key will become blocked for logon. So you may be asking yourself, "How do I get my Mac unlocked?" There is a simple way to remove Rohos Logon Key program from your Mac by booting into safe mode and following the simple instructions on Rohos web site.
Conclusion:
For $32 Rohos Logon Key is a great simple program for locking your Mac and keeping your family off your Mac. Most proficient users could bypass the simple lock. One improvement I would like to see is the capability to register multiple USB keys for unlocking your Mac. A beefed-up security system would be useful so it isn't so easy to bypass the security.
In the Interest of Full Disclosure: We received a free copy of this for review purposes.