Hi there, this is a Aspire only feature. In VCarve Pro you can only import models, take a look on our website to find out more about the different product features: www.vectric.com/compare/ hope this helps!
Thanks for the question. "Easier" in that when it comes to the finishing pass you have more control over how much material is left over the surface. It follows the surface of your composite relief much closer. This will take some of the pressure off your finishing tool. If you try the Z level roughing and look at it in the 3D preview of the toolpath you will see the difference. As for after you run the finishing pass there should be no difference at all.
Once you purchase the software you will have access to the free clipart that is included in the software. There are a few Free projects over at Design and Make you can download - store.designandmake.com/theme/FreeModelsProjects