The FE is useful in that it shows employers, you are fully capable of performing the level of work engineers are left with. Another cool thing about the FE is that as long as you have appropriate industry experience, you can take the FE without a degree. Of course, you still have to be able to pass, but it's cool that a step towards professional accreditation a firm back and a firm mind are all you need.
Also, it's like 5 years of working under a professional engineer until you're able to become a PE. PE's are a little less useful, as most PE's just end up signing paper work for the rest of their days, reviewing and making sure non-PE's work is up to snuff. So PE's can be kryptonite if you're a more dirty-hands engineer.