i'm dropped on sportlines ... you will need a camber kit and your struts will wear out quicker, but you don't neccessarily need to replace them right away. i put 20,000 on my stock struts before lowering and the ride is still OK.
as far as the ride quality, the ride will be busier, you will feel small bumps but it never gets harsh. this is something you'll experience with any sort of lowering spring.
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