I had the FF spoiler....I do think it is worth putting some sort of spoiler to take the brunt of scrapes. I now have the Gut splitter, and with street driving, it scrapes often (my car is lowered).
But again, I'd rather have a spoiler get scraped than my front clam.
Should cover it, mine was\is scraped worse and it covered just fine. Had the FF lip on for a total of 12 hrs. when my service rep drove it to an alignment shop and tore the FF lip to crap and damaged the clam as well. Good idea while it lasted, it looked killer but keep in mind what ever forces are placed on the lip are transfered to the clam. I think you have to drive even more carefully with the lip installed it decreases ground clearance about one inch.
Anyway.... I abandoned the idea that the lip would protect the clam and removed what was left. BTW the shop did pay for the Lip but has ignored the damage to the clam.