I like it and use it for both nymph and dry fly tippet. Sometimes the higher density is touted as an advantage for nymph fishing and as a disadvantage for dry fly fishing, but I don't think that's a really significant factor. However, it is more abrasion resistant, degrades less and is less visible under water all of which are important in nymph fishing. I don't think it makes as much difference for dry fly fishing, but I use it for dry flies too just to keep things simple. I use regular mono for the rest of my leader, but fluoro for the tippet.