We used a small LED for the Key and no fill other than ambient light. I think it held together pretty well up to 3200 and even through the highest, it could be usable for certain creative work.
Audio was plugged straight in using pre-amps on the camera with a wireless. Not to noisy and definately useable but would like to play around with that xlr addon they have to see if the audio is clenaer.
All in All I would not hesitate to use this for corporate interviews, run and gun, steady cam stuff and video blogs. While I wont be giving up my af-100 any time soon, I can see how this camera can be used for many projects and will save alot of time. I am really happy with this camera