I like that Darwin can be used for both heating and cooling as well as providing security and access control. It gives you a centralized view of what is happening in your office or building. It also integrates with other systems such as lighting control, fire alarms, etc. The software has a lot of features but it's not always easy to find exactly what you're looking for. There are many different ways to use Darwin, so some users may have trouble finding exactly what they want. We've been using Darwin for over 2 years now. We have found it very useful for our business.