The ease by which I was able to use this software for several different projects that were required in my daily job duties as an Architectural Technician. It is very user friendly and easy to learn how to navigate through it quickly using shortcuts keys when needed. Nothing at all! This program does exactly what we need so no complaints here. My only recommendation would be to have more tutorials available online because some features are not well explained nor readily apparent with just watching videos. We used this product primarily during our design process but also utilized it after completion as part of final inspection processes.