Build4u:
Here's a crappy phone pic that I hope will help show the difference in the Dillon funnel (on left) and the DAA funnel (on right):
As you can see, the Dillon unit simply "bells" the mouth of the case to whatever width desired. Works fine for FMJ/JHP bullets! But with normally oversized lead/coated bullets, the DAA funnel that "expands" the case with little to no "bell" simply prepares the case for a easy, straight in insertion of the bullet. IMO, it makes for a very stable round prior to raising the case/platform into the seating die. Less expansion of the case mouth while virtually eliminating any scraping/damage to the bullet and/or coating.
Again, as depicted in the pics above, this combination speeds up the process for me!
As always, YMMV.....