The ease of use, the ability to create complex models quickly and efficiently. It was great being able to model an area of land so we could see how it would look before investing in building work. You can't do all things at once, but I think this is down to the software rather than the product itself. I found the documentation lacking, which made learning the software difficult. We used GeoMine to find out how much development time we needed to spend on a project, as well as to help us plan our site layout.