I've got the same combination as you, wheels, bumper and it's lowered on eibachs.
99% of the time it's fine, but the issue is you never know where the 1% will crop up. ramps are the biggest pain, steep driveways will always make me cringe a bit. speed bumps are not so bad, just take them slow so the suspension doesn't compress too much.
a lot I guess depends on your local authority's attitude to road maintenance, where I am they're terrible.