I've got ST X (it's the same as KW V1, but it has galvanized shock body instead of stainless steel body) and it's big improvment over the stock ones. My ride height is as high as it can be, because I didn't want to lower the car much, however it was cheaper to get set of coilovers than some fixed kit like Koni.
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Are they stiffer than oem suspension?
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Yes they are, it will differ on the ride height though - the lower the car is, the softer it will be. If you want want some compromise than maybe try to get a set of AP coilovers - still same manufacturer, but cheaper and they claim that APs are softer than ST/KW.