I have used superlines on spinning reels since someone who shall not be named gave me 5 or 6 spools of Fireline back in the late 90's. It was and still is pretty good, but newer braids and super-super lines like NanoFil take line management to the no hassle next level on spinning reels. If I had to use mono or fluoro on spinning reels again - ugh, not gonna do it. That's the reason I use them, but the leader is more of a confidence thing - I am convinced it helps with some fish, not all. I also like a weak point somewhere down the line to pop off easier than straight superline.