Having a fast, tungsten balanced film is the biggest thing I miss in still photography vs. motion picture.
The Vision 500T looks great.
And Cinelab are highly recommended. They are a rare resource for the motion picture community -- very professional and reasonably priced, even for high-end processes like a Rank Cintel telecine (film to video transfer.) I have used them for Super 8 with Vision 500T and wrote about them for two different filmmaking magazines. Good people, good quality.
If Cinelab are willing to process short snips of ECN-II then I will be excited to shoot some 500T. Seems like a no-brainer for both indoor event photography and low light street photography.