Saw it. It was good.
Darth Vader indeed features in it.
The movie did make me ask one thing: Just what is the point of the Death Star, anyway? The Empire has the resources to scour a planet if life, regardless - blast its surface with conventional weaponry, or even simply flood it with troops that seek out every last sapient being on the planet. Or you could blockade a planet - effectively quarantine it, turn it into a huge prison, and destroy, if not all, at least the majority of ships that leave it, creating an untenable situation for the population who do not have the means to retaliate or even resist. Instead, the Empire destroys an entire planet's worth of resources. That's cutting off your nose to spite your face.