As a lifelong DC fan I can honestly say the Snyder cut gave justice to The Justice League. This brought heart and unity back to the film that I was missing in the first release. It was so much more vibrant and fulfilling. I have already watched this entire movie 3 times. Each rewatch I have caught new cameos, little jokes, and marveled at the enigmatic cast, the cinematography, choreography, and score. Snyder's vision drew me in every time and I didn't even feel the hours fly by. Cyborg and Flash bring so much heart to this version and I'm glad to see their characters given the chance to shine. The ending with the league working in tandem, gave goosebumps, blow by blow and electric second by second.
If you aren't sure of watching a 4 hour movie, take it in chunks. It's broken into chapters, so it's easy to take a breather if you need to but once you're hooked in you won't want to stop watching. If you are a fan of epic stories, thrilling scenes, and characters that slowly tug at your heartstrings until they are playing them like a fiddle, give it a watch. Then give it some love.