Bob C,
All good points, however Freeman lives in Freeport, IL which is near the Wisconsin border, and probably about 100 miles from Lake Michigan. I don't think he will encounter any hurricanes and salt air from the oceans.
Decking clips can be purchased in Stainless Steel as well as Galvanized steel, so that should eliminate any problems with rusting out due to the harsh winters. Also, clips can be replaced without any visible damage to the decking.
I personally don't like to screw or nail through the surface of decking. Even when the screw heads are slightly below the surface, they often leave a rough edge around the countersunk hole and that also traps dirt and is not as attractive as a smooth clean deck, void of any nails or screw heads.
....Rich