by datagram » 13 Jan 2009 12:53
If I am not mistaken the way this works is with a special key and segmented bottom pins and you basically break them apart to provide proper depth positions for the new key. The special key includes a gap on the bottom of the blade that is used to catch broken segments and remove them from the lock. Segments are glue bonded, which makes them real easy to break apart. Imagine a scenario where you have picked all but one of the pins, it'd be very easy to just shear the last one.
I don't own one, so I can't attest to their normal pickability, but I'd say that a poorly maintained instakey could be very easy to pick due to many possible shear lines.
dg