Does anybody have any information about full wall hidden sliding glass doors such as Nana Wall?

Question:Nana Wall has several glass panels that go to one side of the room and leave the whole wall open to the outdoor area (back yard) and allows you to extend your living space outside. The only problem is it's very expensive and I was wondering if there was some other alternative that will do the same thing. Thanks.

Answers:
I do! What do you need to know? Add details OK