I like the idea of the gravity mill and it works as described.  The only problem we have had is the salt comes out too fast and turning the knob to adjust the size does not seem to make a difference.   The shakers are heavy and tall, and two sets are too much for our table, so I would like to return the unopened set.  The one set is great and does not leave a mess of spice on the table or shelf.  It is great to have this set for my arthritic hands, so I do not need to turn a grinder.