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Not sure how much it makes a difference on a boxster but on the bmw, it was quite a big difference - both in sound, crashiness of the suspension... It also corners much neater now.
Anything with cracks can't be good...
I'm not sure if you are expecting too much in terms of comfort on the boxster though... it's totally different on the boxster vs the bmw, let alone an IS300. On the boxster, there is a much rawer feel, with much less damping of every imperfection on the road. With minimal body roll.
I do slow down on rough roads and try to avoid manholes/potholes (maybe I'm more sympathetic on the car). I guess I'm mindful that the previous owner drove only 29k km in 9 years and managed to get all 4 shock shafts wobbly and play in practically every rubber bushing in the suspension arms ...
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