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I too didn't like that silicone front piece, which is why I went with the Formula 4.
When I first got the case, the two pieces were super tight-fitting. After a couple of weeks they gradually started to loosen (which I did not like), and one side actually stopped sitting flush at the seam. I was getting skeptical, so I put in an exchange order with Element.
Then something interesting happened. I washed the case, and it went back to fitting perfectly.
By no means did the case look dirty when I washed it, but I think because it is such a precise, tight fit that even a small amount of dust caused the seam to spread.
Moral of the story: clean it every few weeks and it works great. If you don't you might think it is a design flaw, like I did.
The only real complaint I have is that the carbon fiber backplate accumulates surface scratches fairly easily. Otherwise it is a fantastic case.