Almost perfect
After having this for a few years, I can say that while it may be completely unnecessary to have a super high end salt grinder, it IS really nice to have and even nicer to complete the set. It's super easy to set the grind, it's easy to fill, easy to grind and it looks great.
The only nagging problem is the o-ring retention for the base. It's not a deal breaker, but it is an annoying multi-faceted problem. I don't know whether it's due to electro-static attraction or perhaps due to humidity, but the salt grinds will inevitably stick to the I.D. of the grinder outlet. The moment they do, you can't press the base onto the grinder anymore, it's easier to twist it on. Once you start twisting the base on, the salt abrades both the o-ring and will start to wear through the anodizing on the mating surfaces. Salt, humidity and bare aluminum aren't a great combination over a long period of time and there will eventually be some pitting and corrosion.
If this were my product, I would do a slight re-design to make use of the space in-between the three mounting screws to make a magnetic interface rather than using an o-ring. It would add some milling operations, but IMO it would be a better product.