I've always been from the school of thought that you want your line to be as small in diameter as you can get away with and as invisible in the water as possible. I've always believed that this keeps fish, especially in clear water, from seeing the line and being spooked off of the lure.

Having said that, and having already acknowledged that I'm not a pro, like RCC, I can't help but wonder what the deal is with these hi-vis lines... Are they just for use in muddy water or do they simply reveal a flaw in the more traditional logic concerning line visibility?