It was such shame to even have to have my eyes read the material in this book. Functional analysis is not hard. But, with Conway at the helm, this topic becomes so obfuscated. This text is written so poorly. The notation along is sub-standard, but moreover, there are no helpful examples that guide you to even minimal success in working out the exercises. Thank God for texts like Reed and Simon, Kreyzig, and Rudin. If it weren't for these texts, I would have never learned this subject---let alone, apply it in PDE. I am Complex Geometer. I need Geometric Analysis and PDE techniques, but I would never remotely recommend anyone in Math use this terrible book. It's truly disheartening that this book was picked by Springer. I guess, they've even lowered their standards for what constitutes a good publication. On that same note, I can only say completely negative things about Conway's Functions of One Complex Variable. Terrible as well. Such odd array of topics. That text does not allow for any transition to genus one curves: I mean, really, how can anyone reading that book intelligibly and without massive gaps make it in Several Complex Variables. I didn't care for the unnecessary discussions on approximation methods in complex analytic operator theory. Again, thank smart writers for books like Alhfors, and Rudin. At least, we know that true Complex Analysis subscribers use those books. I learned more Complex Analysis from Griffiths and Harris than that lackadaisical text of Conways'. Too bad. Largely, I can say with confidence that all of his books should not be read---no, no, must be avoided. Don't that charge appear on your account, but moreover, don't let his books ruin your shelves.