There are many comprehensive guides on YouTube that explain the models and have step-by-step tutorials. If you need further support, you can just contact NumXL and receive very professional support no matter what questions you may have.
The program also allows you to customize the output that is sought after.
Regarding the support, it is the best I have experienced so far. The staff is very eager to help and offers detailed explanations through email, video conferences etc. They can even take a look at your spreadsheets and suggest changes, adjust problems that have occurred. Mohamad helped me in all my enquiries and was very professional.
Very reasonably priced as well. Review collected by and hosted on G2.com.