This was a really great introduction to Android, in the form of an intensive course.
For those who work best in educational scenarios, like training courses, this will be perfect. It gave me all the skills I needed to get a prototype app built with no previous Android knowledge at all.
Beware: it assumes you know Java well. If you know another OO language and are comfortable with things like interfaces, it will not be too difficult.
My one criticism is that it is very badly formatted for Kindle. The "table of contents" includes every heading, even the very lowest-level ones, making it very hard to navigate. The "exercise on one page, answer on the next page" thing doesn't work right either. It could do with someone really fixing it up for those devices.