Just reading some more about the device in question. The downloads section of their website has some interesting information.

http://www.cellebrite.com/ufed-support-center/downloads.html

The "Apple iPhone Passcode Bypass instructions" document explains that they can bypass your iphone User Lock, but they need access to a plist file from the iTunes installation on the machine which the phone syncs to, which is often unlikely to be available at a routine traffic stop.