We’ve had the LockDry deck for over 3 years now. Couldn’t be happier with it. Because it is metal, it will expand and contract, so it will occasionally make the noises associated with this, however there have never been any leakage problems… as long as you seal between the deck and house properly. In the summer it is cooler than a hardwood. Installation-wise it slopes away from the house so water runs off from the house out. My joints were running perpendicular to the house, so I had to block in between them because the LockDry runs perpendicular as well. No big deal though.
As to why LockDry? A local distributor. Couldn’t find one for the LastDek waterproof product. The look is great, I went with the beige type colour… easy to maintain, doesn’t matter how much snow sits on there (it’s easy to clean off using a plastic shovel). I did the steps (24″ wide platforms really) going off the deck as well.