like other dude said, I'm not a fan of the drop shadow either. Is this like a tribute to the original disc wars or is that supposed to be an identity disc if so it doesn't look anything like the identity disc in tron legacy... Heres a ss gyazo.com/b615a59ee6a4a636605f…
of one i made just for reference which is pure c4d and its unfinished there couldn't find the final file for it but yeah just an fyi thats what it looks like.
i wanna see this movie too, but mainly because Daft Punk is doing the soundtrack.
anyway, the poster's cool, but i think the circles should have a glow, rather than a drop shadow, which would match the glowing light effects in the movie, or at least get rid of the drop shadow. you could probably make the background a little darker, too. by the way, the movie's called Tron: Legacy, not Tron. Tron was the prequel. unless you were trying to make a poster for the original, of course cool poster though.
ah yeah, i reckon it's better. i don't want all the above commenters to get angry at me now because they preferred the first version :3 anyway, i like the poster more after looking at the link in your description. i guess i should have done that first, i actually kinda get what you were going for now. nice.