With all of those exposed surfaces, I am willing to bet that even with great insulation these buildings are a b**ch to keep comfortable (especially the ones at the top). Architects love new and avant-garde but there is a penalty to be paid when priorities change. High energy costs make homes like these and the Phillip Johnson 'Glass House' less attractive for the upkeep.
Well, that and the fact that Montreal67 is ugly as s**t... and all the stairs!