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The quality varies greatly from one book to the next, more so than with other tech publishers in my opinion.

The Guava book, and the High Performance Postges book was pretty good.

Additionally, something with Packt that you have to watch out for: Some of their titles conflict with each other. I.e. Along with the High Performance Postgres book, theres another book called Managing Postgresql, its not so great ircc.

Many of their books, as far as I can tell, are simply reprints of a framework's API documentation.

Interesting counterpoint to this is jQuery. Their jQuery book came out very early in the game and was authored by people very much involved in the project. Some of the jQuery API docs are actually based on the book.