I have the 6kg SSP line on my softbait set which I use for snapper fishing and squid fishing... I have typically used light braid but the SSP craps on anything else I have tried in terms of strength and also casting. It feels so smooth to fish with and I have landed 3 snapper over 10lb so far without any ill effect in the line. You have to use leader though when snapper fishing. I use the 20lb when softbaiting, the black magic fluoro is tough enough.
Since using the line I have noticed that I need to do 2 extra wraps on my back to back uni knot to connect it to the leader as it is so smooth (my mate uses an FG knot and also does 1 or 2 extra wraps)...it pulls down to be the same size knot as normal because it is so thin so no issues. Strongly recommend SSP!
Give a man a fish and he'll eat for a day, teach a man ta fish and he'll sit on the rocks and drink all day.