Back in the early 80's, I used Instant Ocean. It was the only thing available... and it worked great. Used it until I 'retired', long about 2003. No problems.
In 2008, when I got back in, I grabbed a bucket of IO. Why not? Used to work...
Since then, reading, watching BRSTV, and here... went to Reef Crystals, thinking I needed higher Calc/Alk. A few buckets of Reef Crystals, and I was having to wash brown muck from the bottom of my mixing barrel. Don't want that, switched to Red Sea. One bucket of that was enough to convince me to move on. Brown gunk, and, I decided maybe I didn't need elevated Calc/Alk. Switched to RPM, since my LFS carried it at a reasonable price... until he went out of business. Switched to HW Marine Mix. Good salt, but only available from a single vendor in the US. Switched to Tropic Marin Classic, since it was more available... and now, it isn't.
A few thoughts on the gamut... All the salts I tried grow corals. IO, HW, and TM mix clean, the others less so. I dislike elevated Calc/Alk that you get with some mixes.
I just bought 2 boxes of Instant Ocean from Chewy, $40 a box, delivered.
The wheels on the bus go round and round...