The ride is solid, but not jarring, with improved cornering. Koni shocks are superior (compression and rebound dampening) to the stock shocks and the SumoSprings I guess act sort of as an auxiliary shock absorber. SumoSprings also are an auxiliary spring and allow a more level ride with a load. Sway is reduced around corners and the oscillation when entering/exiting uneven driveways is also reduced, meaning that the number of times it swings side to side is reduced.
Front suspension upgrades:
Koni front struts 872657
We will be in your neck of the woods next summer; if you are around you can see it for yourself.