The book is pretty much as other reviewers have summed it up: extremely funny in places, less so in others and certainly worth a read if you want a quick giggle.
However, anyone looking at the 'buy all three...' suggestion above should probably be aware that one of the suggested books in that trio: "Passive Aggressive Notes: Painfully Polite and Hilariously Hostile Writings." is not, as this tacitly implies, another similar book - it's the same book, just with its American title and cover.
It may be worth buying but probably not twice!