I've used Instant Ocean for years mixed with RO/DI water. It always has the necessary trace minerals, alk, calcium, ph, etc. etc. It's easy to mix and attain the right salinity.
I paid $120 four years ago for the RO/DI and $32 for a 200gallon mix of IO and that's all the expense I have to do as many water changes I want. I figure I pay roughly $4 / month to change 20 gallons of water in my 35 gallons tank ( 5 gallons / week)
And I guess my question would be, why do we need water that is 'alive'? That's what we have live rock and sand for.... And how does this water stay 'alive' in the mean time? I've learned the hard way that living water from the ocean dies off in a bucket in no time, fouling the water completely.
I think you'll have a hard time finding someone around here that will or has tried this product, considering all the information and affordable solutions we have to make salt water ourselves.