I don't play the Chromatic because I prefer the fluidity of the diatonic.
Have a listen to these clips with Robert Bonfiglio on Chromatic, John Walden on Blues style harp and Me playing the Diatonic in a more chromatic fashion.
Summertime - http://www.youtube.com/watch?v=9bXnSMxe5ng
Black Orpheus - http://www.youtube.com/watch?v=FHM5mDszVak
A rough but more jazzy and outside version of Summertime played on the diatonic http://www.youtube.com/watch?v=RNw5xA1lJRw