I've been doing this for 30+ years and I believe it to be amazing!
My corals are so happy,.. + the only salt I have ever mixed that truly mixes 100% clear and clean with nothing left over in my mixing containers,... nothing,.... no weird stuff floating on the top,..no discoloration or cloudiness, no little undissolved bits of whatever on the bottom,... nothing,... crystal clear to the point I can look in a container, (large 55 gallon mixing vats) 5 minuets after I have mixed in the fourth part, and not even tell if I have mixed salt in or not until I taste it or use a refrac.
I have to admit to being a good friend of Bob's though,.. so I may be a bit on the bias side,..you should ask others as well, (who have used it).
All the best-Dave L