I used Instant Ocean (regular) for 20 years then moved to Reef Crystals a few years ago. Mainly because it's what was cheap and available locally to start with, now I get the 160 gal. bucket from F&S shipping free for $40 so it's still my choice. Just like anyhting else in the industry, some love it some hate it, some could care less. It's your money, your tank, and it's all basically the same stuff when you get past the labels and dollars.