Christian
As JohnnyBoxer says the pannier rails screw straight on - BVM fitted them for me at the 600 mile service (no charge - coded the pannier locks at the same time - no charge).
I love the GSA, as long as your careful about choosing which tracks to ride (see "how to get a GSA really stuck") it' s very capable off road and a great road bike.
I think BVM gave my wife about 10% off (she bought it all for me as a Xmas pressie) - I had a Savanna 2 suit (jacket, trousers and liners), a pair of Savanna boot, GS Gloves and a Tour X helmet (all my kit was either destroyed or cut off me in my accident).
I find the Savanna kit excellent, totally waterproof, comfortable and with enough armour to keep my wife happy. It's heavy but I'm big enough not to notice it when its on.
Now thinking about getting a Schuberth C2 helmet as well (my Schuberth Concept saved my life in my accident) as I have trouble with the double D ring fastening of the Tour X as - my left arm won't bend properly nowdays.