I am EXTREMELY OBSESSIVE about my privacy yet I still decided to take a DNA test.
I am glad I did, because despite obvious hints that I ignored, my biological Grandfather was not who I thought he was. Amusing is the fact that I grew up thinking my other grandfather was my step grandfather, solely because his wife was my step grandmother, a child's assumption.
I personally prefer the DNA data to the pictures, As I always turn off pictures on fan charts. To each their own.