The galaxy is a good phone, but I never got one because I don't like Touch wiz and the physical button on it. And the finger print reader I wouldn't use. I think it's easier for someone to open your phone then a pin or pattern password. Someone could easily just swipe your finger while your sleeping at home.
Maybe your the kind of person who doesn't want family checking your phone for what ever reason, or you could be catching some zzz's at a friends house and other people decided to stop by. There is your phone on the coffee table, and your finger, well lets just say they know where you keep that.
But all and all we know if anyone is going to break into our phones unfortunately it's going to be someone we know. Sad but true! I will still use a pin or pattern on all my phones.