I am in the process of purchasing some Azek Decking, Now I have to figure out which way I am going to fasten them. So far I'm thinking of using either the cortex Hidden fastener system that is a face nail and plug or the CONCEALLoc fasteners that hook into the grooves of the decking. Does anyone have experience or recommend one over the other? My Carpenter said he prefers the Cortex because the wood feels more secured to the framing and he has seen some decks feel bouncy when the CONCEALLok have been used. I also spoke to the local building supply place who echoed the same thing. http://www.lowes.com/pd/AZEK-CONCEA...k-Hidden-Fasteners-85-sq-ft-Coverage/50381534 http://www.fastenmaster.com/products/cortex-hidden-fastening-system-decking.html What are your thoughts? Thanks!