I've been using it and its not anymore expensive then reef crystals, just depends on where you buy it.
The cal and mg lvls are great with it and it mixes well, but the alk sucks. I have always had low alk with using this salt.
Right now Im mixing Oceanic and trying the new D-D H20 salt. I only bought the small bucket of that because of the price, but the lvls are great on it.