If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.
I have had the S5 1 for some time and love it for moving pictures. I have recently bought the X and yet to get amongst the features in a comprehensive way. I am pulling together some of the primes based mostly on the focus breathing performance for the price point.