Binishells?

I apologize if this topic has come up before, but has anyone heard of/built/seen a binishells? From what I can tell, it's a steel reinforced concrete dome structure built using an inflatable support. The only online price I can find says they start at $3500, but I don't know what size and if that includes labor.
http://www.binishells.com

Pretty interesting al, i had never heard of the, before. From reading around the web a little bit it seems most people consider the contruction to be finicky or difficult in some way. I also found that a few of them that were designed and built by the inventor collapsed.
binishells at wikispaces