A big difference is the quality control from the factory, I've had racelands I had to mill, redrill and heat/bend locator tabs to get them installed, to the point I refuse to fool with them unless the owner pays for an extra 2 hours labor up front. The FK are generally OK but occasionally need a little fiddling to get fitted. (perhaps grinding a single messy weld clean or such) My experience with Bilstein is that they bolt on as if BMW themselves had built them and wanted them to go there. 
As for the low. . . we took off bilsteins b/c they didn't go very low

As for the low. . . we took off bilsteins b/c they didn't go very low

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