You can easily send the models you create to others. Even if they don’t have Vensim they can use the Vensim Model Reader to view and simulate the model. Also many models can be read by less powerful version of Vensim. Thus, even if you are using Vensim DSS, users of Vensim PLE may be able to work with the models you are developing.
Vensim DSS provides additional options for packaging and publishing models. These are described in more detail in Distributing Your Work.