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Do you mean swap springs as in changing the springs out to new ones or just removing them to install the bils
The Bilstein 5100 adjustable shocks will require you to remove your factory strut and reinstall your stock coils on the Bilstein strut. Then there are notches with a C-clip and you can set the preload height on the strut. I believe there are either 3 or 5 setting its depends on the vehicle. They go up in like 1/2"-1" increments something like that. With the Fox or King or ICON coilovers you are completely removing your factory coilover assembly and replacing it with the new coilovers. So the Bilstein is just a strut change using the stock coils while a coilover replaces the whole factory strut assembly. I hope this info helps and makes sense! I can do my best to guide you if you have any other questions! -- Sean
You don't seem many reviews on the Fox units because they don't go as high as some other options, and because most of us are running on the street or slowly offroad. For our usage, they accomplish the same thing as the Bills at 1.4" or 2.1" but cost 4x the price.
FYI - Just saw 8 Bills in stock on Amazon today. Get 'em while they're hot!