The best feature is that it works well on both windows and MAC OS. It has been very helpful in my work as an engineer. I have used this software for many years and it has always worked flawlessly. There really isn't anything bad about this software. Sometimes when I am using it, it will stop working and I have to restart it. This happens often. I use this software daily so I can't say that it's not useful, but I wish it would work more consistently. I use this software primarily to help me with my job duties. This software helps me figure out where the faults are in the structure of the building and how the building is built.