I've been using Berkley Vanish. It's not the same junk it was when it first came out. This stuff's been greatly improved and the price is right. As for lb. test, it depends on the lb. test of the braid I tie it to. Usually 8lb. flouro to 15lb. braid,10lb. flouro to 20lb. braid,and 12lb. flouro to 30lb. braid. Sometimes I wonder, whats the point in all the fuss? Several times I've been out fishin' and snag up and have to bust off my leader. Fishin' from shore without a boat to carry all that stuff, I just cut a few feet of mono off my spinnerbait rod. And you know what, it works just as good! With only a few feet of line, you don't notice more line stretch or less sensitivity.