Buy it, it rocks.
This is an absolutely hilarious showing of what Seth and the Family Guy crew can produce.
The film is mainly about Stewie, trying to find where he belongs, after a near death experience.
The films opening goes on the same lines as Road to Europe and Road to Rhode Island (which happen to be my 2 favourite episodes).
With this film being very newly made there is a lot of current topics being made fun of (britney spears fatpregnantstate being one of them), and the fact it is less censored due to its DVD state means there are a lot more F's flying about.
A lot of crazy things happen in this film, leaving you with much anticipation for the 5th series of the show.