I've just watched the Ultimate Edition Blu-ray.
Theatrical Version - Not bad at all until Lex Luthor appears, and despite his manic behaviour the film starts to feel extremely leaden and poorly paced, persistently so. Pleased I didn't watch it at the cinema.
Ultimate Edition - The extra material gives much improved pacing, much more engaging and watchable, and overall a very enjoyable super-hero film. Also, some of the plot points are better explained, the film clearer and less confusing.
Affleck is great as Batman, real weight in his punches, looks like an intimidating bruiser in his fight scenes, fine as Bruce Wayne.
Wonder Woman - a great version, obviously set up as DC's Captain America with her force-negating bracelets and shield, and the fast, acrobatic fighting style.
It would be more interesting if Yuga Khan rather than Steppenwolf was the villain hinted at.
Overall, the Ultimate Edition extended cut was definitely a good purchase.