I use it.. Its the best out there. If you do 10 percent WC every week, and as long as you don't have a high Ca load, you may never have to use Alk Ca or Mag additives. If you have a lot of sps lps and and other you will probably have to dose some :]
Oh yeah and make sure you read the directions, Ie. always start with less water than 5 gallons or whatever gallons you are using because it is a four part mix and if you have too much ro water your salinity will be too low and its a pita to back up. easier to add water to lower the salinity. Andddd. get a graduated 250 ml 0r 500 ml plastic measuring cylinder, its is lot better than weighing liquid on a digital scale as I have seen others doo. I can go from mix to the tank in as little as ten minutes.. It mixes up crystal clear