The pen ones are great as a PI. I love them. Occasionally I'll get hired to do an asset verification case. That involves going in and talking to a person who took out a large loan and isn't paying it back. Basically, the PI is being used to make sure the person knows they cannot hide from the courts. When I go in to talk to them and deliver the legal paperwork though, the client will often want images of people's faces. Well, the pen in my pocket gets that automatically. ;-)