The simplicity of creating Uml Diagrams,it's easy for people who are not very experienced in this domain can easily understand its use which helps me as an Architect to visualize my design ideas more clearly.
There is nothing found with dislike about it so far. I like how simple, effective and efficient tool have made us architects work much more efficiently than before. This software has helped our team to communicate better over emails or meetings by sharing designs via online link rather then sending physical files/drawings.