To be honest all this skin cancer detection stuff is kind of non-proven to be effective. Problem with this is that it leads to overtreatment and a non-measurable prolonging of life-time.
the best defense against cancer is early diagnosis. the point of the device is to help with this. if you have the opportunity to check moles with a doctor - it is better to do it with him.
I'll tell you a secret-human life ends. and all of us will leave this world sooner or later. but to die because of old age, in the circle of grandchildren and great-grandchildren, or at the age of 40 from a missed cancer-it's up to you. I just encourage people to take care of their health. if you don't like the device, make an appointment with your doctor. it's summer (if you're not from South Africa or Australia), it's time to check out your moles