I have a friend that likes to use a fluoro leader on the end of the superline. He is a great fisherman, often out fishing those in our group, so its hard to say if his efforts are the result of the fluoro leader or just being a smarter angler.
Personally, I don't like fluorocarbon as I've found it too brittle as well, compared to Maxima monofilament I prefer for leader tippet.