Interesting. So, what is the vital property of the fluoro tippet? Visibility? It's clear there are days when fluoro lights up like a neon sign - see the video clip upthread. And then there is the fact it is dreadful stuff to get to cut through the surface film in fine diameters. My rejection of fluoro for stillwater dries has not been for the want of giving it a good try these past 30 years!... and I am fishing lochs for wild brownies and wary, grown-on rainbows...Certainly if you want to catch big wild brownies on hard fished water then fluoro is the way forward. Yes it is harder to use but there are times it is the only way you will catch. It requires restraint and accuracy, you can't just chuck a fly out and wait for a fish to come and eat it, you have to cast to the feeding path of a fish. I've fished with Gareth on a water like that and we both used the same thing, 6x frog hair fluoro tippets off nylon tapered leaders. Treat the leader to float and the tippet to sink. For rainbows and most wild trout in most conditions use nylon it won't really matter but there are times where fluoro is absolutely vital to success.