The ability to create complex structures in seconds with full control over all aspects of your model - strength, stability etc! It's very easy for anyone who has basic knowledge about Solidworks or AutoCAD (or even less) to use it as well. I think there are several things they could improve, but nothing too serious compared to other products out there. We used this software during our studies towards obtaining our degree from university and we were able to make some pretty complicated designs within minutes using only CAD tools and no need of any mechanical engineer expertise. This allowed us to get feedbacks regarding structural integrity quite fast without having to go through trial-and-error approach which would have been much more time consuming than making an initial design. Also being so user friendly allows non expert users like myself to be involved into such projects.