I use salinity, and always have in my 150... I second the thought of it needs more mixing time than standard salt but it has been great so far! My thought is the price is fair for how much it makes.. What's the big difference between the aquavitro salt and just regular salinity?
Maybe all salt mixes do this (this is the first tank I have mixed my own water), but after everything is mixed and I'm done with the water, there is always a little small pile of crap in the bottom of my bucket that needs to be washed out.. Not sure what it is, but just stuff that didn't mix.. Either way, never had an issue with salinity.