I've just had the Comfort Steering mod and it's really good.
Bump steer is dramatically reduced and only really affects the trajectory on large bumps or potholes. The car is much more stable on bumpy lanes and nicer to drive. The steering feels a little bit lighter and I wouldn't say I've noticed the need for any more lock on bends. Overall a very worthwhile mod which enhances the character of the car.
I had mine on a trackday this week - Goodwood in the wet - and understeer / 3 wheel drifts were common together with the odd bit of tail out coming out of the chicane
- and understeer / 3 wheel drifts were common together with the odd bit of tail out coming out of the chicane 
