I have had each version of Turbocad since 15 or 16, using 20 now. For modeling use there is not a lot of difference from at least 16 on up. Most of the changes have been in the architectural tools, the rendering tools, and some additional 3D tools. The latest version, 20, has the ability to use an interface like the command line in autocad, if that is what you prefer. Any "Pro" or "Platinum" version is a better product than even the latest "standard" or "deluxe" version. I don't know much about support from the company, IMSI, but the Turbocad Forum is full of extremely helpful and knowledgeable people.