I have never paid a whole lot of attention to salt, to be honest. I tried that Continuum salt and hated it because it left a thick white scum in my bucket, then switched to Tropic Marin salts and have been using those ever since. I do have to add to them to reach the alk levels that I prefer, though.
I got two boxes of the AF salt from our last group buy, but have only used it once so far. It mixes super clean, though, so I might totally switch when I'm out of TM.