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 own the S1R2 and use it for street photography fitted with the S f2.8 24-60mm lens. This lens does not have an aperture ring which means I'm letting the camera choose the aperture for each shot.
I have tried and tried to figure out how to set the aperture myself via the camera body but so far...