02 wrx wagon, 2 winter seasons on mine and no issues yet.
Im pretty anal about keeping my car clean.
Not showroom, but clean.
I try and wash my wheel wells and underside at least once a week in winter, I wd4o the coilover exposed parts like threads and adjusters.
I rockin bc's btw, which imo seems like perfect for you.
I dont remember the name but theres a newer company that has the same style/price range setup but the difference is they are garaunteed for life.
How the **** they do that idk. IM someone else can chime in with that companies name or call ssm they'd know.