This book has taken me completely by surprise.
An extremely deep, challenging and layered work of fiction with references to classic literature and puzzles that reward the reader. The world building is realistic, dense and keeps you wanting to explore it more.
In a way this is exactly what I've come to expect from a science-fiction novel, but I feel that after reading "The Fifth Head of Cerberus" it's the first time that a novel reached that level of expectation.
I have to admit that listening to the Gene Wolfe Literary Podcast has helped immensely to understand all the themes and references woven throughout the three connected novellas.
It's the first work I've read by Wolfe and I can't wait to dig into more of his work.