I've always used it as well, and do get the same brown tint. I started using it when I got in to saltwater, and it was the one on sale at the time. I've never had a problem, so I have never seen a reason to change salts.
If nothing else I suspect it is the cause of what most people think is an incredible growth rate of coraline in my system. (granted, IMO, its a PITA)