Not a massive difference personally, I like the idea of a bigger screen but I do find it kind of is a bit intrusive sometimes, I'd be interested to see how much it gets in the way (also think it should hide when not in use).
Looking at what I've changed on mine (carbon inlays and RS grille) I can't really see how this 'looks' any better now, I'd even say the current S5 wheels are better. Mine is due to be swapped in April and I'm really torn on if it's even worth switching to one of these now, I'm thinking of saving some money and going for one of the new S3's when they arrive.
Also the clicky MMI wheel changing is a welcome change!