I have been experimenting with Flourocarbon for two years now and I have found that, for me at least, it works best for jigs and weightless plastic. This experiment of course is on going, so take it for what you will.
The two lines that I have tried so far that have worked well are Gamma and believe or not, Berkley's new Trilene Fluorocarbon. The thing I noticed with these lines is that I get more strikes from bigger fish. The knot strength is excellent with both, the stretch is better with Trilene Fluorocarbon, the Gamma cast better on a baitcaster but not on a spinning reel, and the Trilene Fluorocarbon works OK on spinning reel but I have yet to find a flourocarbon that works as well as Yo-Zuri or P-Line on spinning reels. One thing that Trilene Fluorocarbon excelled in was that it does not kink as bad as some flourocarbons. IMHO, once you get a kink in most flourocarbons, you have the potential for the line to break and fail.
Is it worth the money? Maybe, I guess it's just a personal preference.