I liked that it can give you some of your technical specifications as to what will be needed for manufacturing, but sometimes this info isn't enough! If there are any errors in dimensions or other details then they do not appear until after submitting an order which defeats part number accuracy (sometimes). We used Autocast when we were designing custom parts so our customers could see how their new products would look before committing too much money into them without knowing if people wanted/needed something like theirs first hand - just imagine being able get feedback from thousands more potential buyers than yourself with no upfront investment?