I have a couple of Fluoro furled I made...of course they are nice. But as you mentioned, stiffer and costy. Thread and Kevlar if you want to nymph, not to mention strong as all get out, but still that thread flexible. BUT, I always use Fluoro for the tippet, my choice, but I am always trying other things...made a few changes along the way. I feel that is a good thing. Curious about something, Try it. Then you know for sure.