I would stay away from Timber Tech. I did a huge deck on my house using the interlocking hidden fastener system. I had a lot of problems with it buckling and staining. There is no give in this system so temp extremes cause the boards to buckle along the width, eventually cracking and spliting along the length of the board. Also they stained, I don't know what it was maybe tree sap or bird dropping but it looked like grease stains. Nothing took them off, they felt like they were coming from the boards.
Timber Tech provided new boards, I went with the more traditional style held down like real wood with screws through the face. I paid for the labor. These have not split and seem better. They do sag a tiny bit between joist 16" on center. And they still have the staining issue. But at least the deck isn't falling apart.
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