Since I started fishing 20+ years ago, I've always used Berkley Trilene XT without any problems. Then some of my bass fishing friends said flouro this and that, so I tried out Seagar InvisX. It casts really well but if it touches anything in the water like rocks, trees etc. it becomes very weak. I moved over to Berkley Trilene 100% Flouro and it seemed much better and stronger especially in rough conditions. Did I catch more fish using these lines? Not that I could notice. Did I waste a ton of money? Yup!
What happened before flouro? Were we all still catching tons of fish? Can we really say that flouro is making us more productive on the water? Maybe it's the lures, better presentation, or maybe you're in the right place at the right time? Who knows.
Also there has been some outings where my friends kick my butt and they are using the cheapest line, rod/reel, and lures you can find. I'm sure all of you know some people like that.