Mark Rippetoe and Zach lift in old dress shoes
Rip is also a big fan of a small heel while deadlifting (smaller than a classic olympic heel) and says that the added quad drive outweighs the larger range of motion (don't forget the range of motion increased is that of the mid foot, not the heel) and there is no loss in posterior chain activation.
I however, hate it and deadlift in chucks