This movie was a great surprise. I knew nothing about it when I started watching and hesitate to spoil the premise—although it comes out so early in the film that it shouldn't do too much harm to reveal that the plot loosely relates to that of Groundhog Day.
As with most films in the comedy genre the comedic part decreases sharply in the second half, but I still found the whole thing refreshing and enjoyable.
Give it a try!
Edit: on second viewing two years later, I still love that movie. One of the best comedies of the decade.