To start using Vellum, all you need is a basic understanding of how to use Macintosh software. Ashlar follows the Apple user interface guidelines and Vellum behaves the way you would expect. MicroStation on the other hand, is an example of a very capable, powerful product that retains its workstation heritage and does not abide by the Apple User Interface Guidelines, e.g. there are four windows highlighted and apparently active at once. Vellum provides a complete 3D drawing environment It is completely capable of being used as a 2D drawing application also. In the 2D world, Vellum is an excellent product.
Installation is as simple and as straightforward as can be.
Vellum ships on three disks and is installed by an installer. It's nice to see such a powerful and capable piece of software still be a reasonable size. As Vellum has gone through revisions it has grown slightly in size, while the capabilities have advanced at a much faster rate. Vellum has not become a behemoth, such as the likes of Microsoft Word. There are two versions of Vellum.