Would you say it's worth getting? Are you enjoying the game so far? Is the story any good? (Sorry for all the questions!)

Make sure that you're using anti-aliasing if you're running at 640x480 (if you have a semi-decent graphics card). I used 2x at that res and it makes the world of difference (gets rid of the jaggies), making it bearable. Also, is the default configuration still for the x-box, like with the demo? The only way to know would be to go to the Deus Ex forums and read up on ini files changes, or get the tweaker utility (I can't remember the location of it) to do the changes for you. I doubt they'd make that mistake twice, though.

I played the demo with the settings on medium for the second page (shadows, lighting and models, I think they were), and no bloom (it just made things blurry and less detailed, tbh.) It ran okay.