I have actually been using both. I have a DI unit and Reef Crystals...not my favorite salt, but about the only one I could get shipped here reasonably at the time.
I also do collect NSW at high tide, for Kadena lagoon, sometimes the sunabe seawall. I let it sit for a day or two just to be safe and allow any cryptocaryon potential to pass. I do agree with you guys that it is not water that would meet our standards in the reefing community back home, but my logic is that I am collecting the water from where I caught most of my animals....4 percula clowns, 1 sailfin tang, a sailfin algae blenny, a S. haddoni carpet anenome, and a S. mertensii anenome. I have a few other things...but they were collected elsewhere. anyway, these animals were thriving in this water, so I use it on their tank. I have used more mixed water on the SPS tank. So far, I have had no issues.
What issues have you had with the lagoon water?