Wow; old thread.
CC3's interface is essentially the same as CC2's, but they've added quite a few features. It can be a bit counterintuitive to learn, especially if you've previously been exposed to a paint program like Photoshop or Gimp. CAD users, on the other hand, will pick it up fairly quickly, since it is built on a CAD engine. It's definitely more difficult to learn than Photoshop, but a great deal easier than something like Blender.
And since this is such an old thread, I should amend my earlier post: ProFantasy has added antialiasing to CC3. I haven't used it since that was added, but the maps produced by other CC3 users have been looking significantly better recently now that the "jaggies" are gone.
Bryan Ray, visual effects artist