The movie is just three episodes stitched together into a loose narrative. There are some extra scenes, which aren't bad, but this is an extended clip show at best and a blatant cash grab at worst. It actually changes some of the plot points from the episodes it uses as a base in order to change the narrative. The added scenes really don't add enough to call this a movie.
In all honesty, this is best used to scratch the itch of wanting to watch the show a year after you finish the series, not the day after. Either way, I wouldn't recommend paying money for this alone, but if you have access to it, it's probably worth a watch after you give yourself some time away from the show.
