I have only used a couple of UNI leaders that were sent to me a year or so ago. They sink more than I would like for dries, even when dressed with Aquel, and don't really sink as much as I would like for stillwater fishing which is the bulk of my fishing. They are just about right for wets on a stream.

I had bought some fine Spiderwire to make thread pullers with for my rod building and don't like it for that purpose. Has anyone tried it for furled leaders? I haven't tried it myself as I have had too much other stuff going to build a furling board, but I have the impression it would sink pretty well. It's limp as all get out as well.