It's not bad actually. I would say it's just a little more rough over bumps. Not sure how they feel without shocks to match....probably the same.
You know what's funny is I don't have to drive over any speed bumps here...I work on Kelly....
But my base in Germany had plenty....I don't remember the speed bumps bothering me anymore than they did with OEM ZSP...
In the process of restoring an 07 335i