Cons? 1. It's from Bu....gs
2. I'd never use any composite for my own decks as it will look crap after use. Any scrathes/stains etc can't be sanded out and refinished. I am yet to see a good looking 5yr or older composite deck.
I like the theory and would probably use composite materials for battens but at this stage I am yet to be convinced of it being a good choice in decking....and if the green shed sell it well it will be a cheap and nasty version IMHO.
At work we had replaced a timber bridge over a water feature and link between two buildings with a composite board (big brand name but can't remember just now). It is slippery when wet so I imagine it would not be ideal around a pool.