I like that it allows me to model many different events in order for my business process flows, as well as see how they interact with one another (or not).
It was fairly easy enought when first learning but can be overwhelming if you're used to other simulators or don't know what's going wrong right off of reading something online about using these types of programs/hardware devices. The biggest problem we've had so far has been our lack of knowledge regarding this type equipment itself which makes troubleshooting very difficult at times because most people have never worked directly within an industrial setting such automation before! We are working towards creating more processes through modeling certain steps from start-to finish instead doing everything manually by hand each time there needs to be any changes made along those lines - thus saving us alot of hours upon initial setup & running tests throughout production cycles once implemented into real world situations.