Zack Snyder's version of his movie Justice League is vastly better to the 'original'.  This is mostly due to good changes in cinematic choices, overall visual style, better editing and a longer story.  The one major, major downside to this movie is it's length.  While still a good movie, it is not worth four hours of my time.  I will not be watching it again soon for that very reason, but the movie itself isn't that bad.  There are more scenes than the original release and they are longer, making the story feel less disconnected and letting the audience develop closer relationships to characters like Cyborg.  The ending is vastly improved, the VFX got a major upgrade (especially on the villain design), and the overall style (especially with the aspect ratio) is brillaint.  Overall, a good watch for superhero fans, just prepare to take a bathroom break.