Well, I've just spent the better part of two days getting the darn thing installed and working, and I'm not done yet. I'm sure hoping there's some payoff in the end.
I'm a bit worried that the only real endorsements have come - directly or indirectly - from authors, and they tend to work in a different environment that the rest of us.
I see the book you are using was copyrighted in 2008, so that suggests that PEAR is not totally obsolete.