I especially like Silverberg for its time travel and this one ...

Presentation:
Monads are gigantic skyscrapers. Y men live at the end of XXIV century. In this case, the men move in a thousand towers floors fully equipped to meet all their needs. Depending on whether more or less lives up in the story, it is more or less rich, there is a more or less important role in society and life is more or less easy.

Critical:
Problem: too frequent allusions and descriptions related to excessively liberated sexuality of mankind of the future, as if the interest of the novel only resided there. Without being prudish, I find it a bit boring after a while.
Otherwise, the story is interesting in view of the imagination of the author about life in the future, with an allusion to the environmental degradation in the centuries preceding the time of the action. A social foresight taste a little oppressive and disturbing ...

Conclusion: I read "The Urban Monads" there is a moment, but I do not keep a very pleasant memory. I prefer Silverberg in "Temporal Deserters", "Parallel Time" or "The deportees Cambrian".