I haven't finished the book yet, but I have to say, if they would just stop inserting supposedly homorous asides every third sentence (one of those cases where they think they're funny, but they're not), this book would move a lot quicker, and I would learn more because I wouldn't be constantly distracted by something I thought was going to be useful information, only to realize it was something I should have ignored.
Humorous example projects and explanations using odd names and unique problems can be fun and memorable, but using tired, corny and just plain dumb jokes for the sake of seeing them clutter up the page is not only insipid, but annoying to those who put their brains in "learn mode" to get information, only to be distracted by "jokes" that add no value whatsoever.
That said, the book is definitely informative when it comes to the Xcode toolset-- if only there wasn't so much fat to ignore to get at the meat.