I use Red Sea Coral Pro and have had excellent results. Primary reason being low alk as I'm doing ULNS. I know Reef Crystals is going to be the biggest winner on this poll as it is cheap and readily available but I used to use it and my corals hated the 12-13 alk. Red sea is just a bit more but worth every penny.
I use Crystal Sea Marinemix Bio-Assay, and look to be the only one so far in this poll. I've seen the stats on this salt listed before on here, and I can tell you fist hand those results are bogus. I've never checked the CA below 400, but the other two are pretty much spot on.
I use it because it is made local to where I live, the price is right, and my corals tell me they love me for it.
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