I've read it. Recently actually. It is really cool. It kind of supports my point though. It's hard for those to both comprehend and describe that have been in higher dimensional spaces and much of what they do describe is in 3 dimensional terms, (enclosed spaces being visible as if by an open top being a good example of trying to comprehend a thing that would be uncomprehendable in 4d through a 3d mindset). Of course, it's also written by an author that hasn't actually experienced such things and is also trying to imagine what it would be like to experience his interpretation of the phenomenon, so... not exactly conclusive either way.