So I got a call from the local Azek sales rep last week. He wanted to show me a new paver. Since it's still winter up here I agreed to meet him at my shop the next day. Well check out this product. http://vastpavers.com/ It's literally rubber/plastic. I have a few samples. They are ugly as sin but I do see a market for them particularly in rooftop applications. They make a thin model that is light and would work good up there. Other than that, I don't see much use for these things. Maybe LEED credits. Oh yeah, they are $9 a square foot! He recommended NOT using poly sand or sealers for joint sand so that's a negative too. They require same base prep as concrete pavers. Check it out. I'd like to hear your thoughts. Particularly if you used this product in the past.