when I first got the plus, I tried using only a pin...that got old in less than a day. then I tried the iris scanner, which worked OK with glasses, but you still had to have the phone in the "perfect" spot. then face recognition, used that for about three days. it was ok, but still you had to have the phone in the perfect position. so, I gave in and tried the scanner. I'm a lefty, and within a day or so, I haven't touched the camera since. with a case I'm probably 95% accurate on the first try hitting the scanner. and it's super fast opening the phone.