These are awful quality, as generally any salt or pepper that comes "prepackaged" in a grinder tend to be.
If you're really interested in moving to a more nuanced salt in your cooking or finishing of dishes, consider going to a specialized salt supplier. The Meadow is where I got my first legit gourmet salt and would recommend it to anyone. Yes it's double the price, but it's WAY more quantity and quality.
Here's a link: http://www.atthemeadow.com/shop/Gourmet-Sea-Salt/Salt-Sets/Foundation-Salt-Set