I know this is a relatively old post (ish) - For what it's worth. I am installing it onto my 500D as there are no manual modes for the video option on the camera which is a bit of a pain. When it is completely up and running I will be posting some stuff on here, if it's any good of course.
I am quite looking forward to trying to film in RAW mode (if I have fast enough and big enough cards!), the 5-8 bracket HDR (500D can only do 3!) looks exciting and motion detect. Just everything about it appeals to me, I'm sure if I get fed up I can quickly reinstall the latest firmware.