There are also several short films on YouTube on Tentsile tents.  They look very interesting.  Checked E-bay for available tentsile tents and see the cheapest there was about $450 and some as high as $750.  I paid $375 years ago for my Dryad and like it a lot but would be nice to have additional room like the tentsile has.
Note: On my last drive across country (October 2016) I was told by campgrounds NOT to hang my tent in the trees in some places; apparently any damage to the bark on Oak trees is an invite to a wilt disease that attacks the trees and eventually kills them.