Don't waste your money on rental. Buy it. It is their best movie. I believe there is a deleted scene on the DVD dealing with a suicide mission. There aren't more than half a dozen skits in it that aren't perfect.
It is their best movie. I never thought of it as being there best, but lo and behold what IMDB has to say on the matter:
User Rating: ********__ 8.0/10 (25,579 votes) Vote Here top 250: #157
Ranked #157 of all time! I'm astounded.....