The model can be visualized at all time-steps in a very short amount of time. This makes it possible to make decisions earlier on than with traditional models or other simulators. The interface could be more user friendly, however, in general everything works great. There are no free versions of this product (pro version). If you want to do some really big projects, consider purchasing a license for this product. You will have access to the best features, which is not available in cheaper products on the market. It is an ideal tool for design, analysis and optimization of wastewater treatment systems. The ease of use, visualisation capabilities and ability to simulate large systems with multiple interacting components.The relatively high initial cost for entry level users but this can be offset by using 3rd party add-ons (such as the Powerplant Pro module). We have been able to model our wastewater treatment plant in detail without any previous experience or knowledge of programming. This has enabled us to develop solutions that were not previously possible due to lack of data.