I don't know, I personally think that money can be allocated elsewhere.
I landed on Instant Ocean and stopped playing the game of which salt is better.
Unless your tank is new, most people have to dose to achieve the proper levels of calcium carbonate for their tank. Whether it's 2 part, kalkwasser, calcium reactor, all for reef, and the list can go on, you adjust the amount based on your coral demand.
The main difference in salts are the levels of elements (major and trace). But the big ones we all concern ourselves with are the major elements (alkalinity, calcium and magnesium). Those vary from brand to brand, but none of that matters because youre making up for it via supplemental dosing. In essence, you're basing your supplemental dosing on the brand of salt you use. In the end, the results are all the same. So the question becomes, how do you want to pay for that calcium carbonate? In the salt or in the dosing? Do the math and see which one is much much cheaper.
The only way salt brand makes sense is if you're solely relying on waterchanges to keep up with your tanks demand. Otherwise save that money!