I've used Cajun line in 8# test in fresh water and it seems OK, a bit of memory but not too bad. In heavier test it might not be a bad leader. Remember, even though they say red is the first color to not be distinguished as you get deeper in the water, it doesn't mean it becomes invisible - it means it looks grey.
When you consider how much you actually use in a season, flouro really isn't that expensive and it's the only line that truly does hide in the water.
Triplefish is good stuff and a lot cheaper than most of the others.
And yes, Vanish is GARBAGE !
"I just wanta play everyday despite small nagging injuries --
and go home to a woman who appreciates how full of crap I truly am"..... Crash Davis