Mylo, I've used several different sinking leaders. One was furled and then had a coating on it. It worked well with a sinktip line, but was very slow sinking with a floater. The others I've used were the Rio series, and IMHO when I used a leader heavy enough to sink the fly at the rate I wanted with a floating line the leader was too stiff for good casting. My fish catching was not improved by using them so I've gone back to standard tapered leaders. I do keep a 1' and a 2' section of LC13 line in my tackle kit in case I hit a spot where more weight is needed to present a fly. I think I've gone 3 years since I last used it.