Well had the 2013 Roadster a week now and been comparing it to my 2010 Roadster. Firstly visually and in the flesh side by side it looks sexier (I think) with the all the extra black, I’ve added the black screen and a colour matched belly pan. The new seat is a better place to sit too.
As to performance on the road, yes there is defiantly more fluidity in power delivery (mostly torque) in the lower gears - the power/acceleration is more readily available. Obviously this is seat of the pants feeling, after riding the two bikes back to back, would have to dyno them to get the true difference!