The Sigma DP Quattro is one of the strangest but also for some aspects very intriguing camera. Just watch the video on top to see if the camera suits for you :)
And if you want to read more about the camera check out this list of the most recent reviews and tests:
Sigma dp2 Quattro review (Digitalversus).
Test in Spanish by Quesabesde.
Sigma DP2 Quattro Review (Photographyblog).
Full review at ePhotozine.
Sample images by Outbackphoto.