This plugin is packed with features and functionality. Documentation is probably a bit lacking, but the support is great and Michael was quick to reply with suggestions on how to implement what we needed once we raised a support ticket. There's several templates available that you can use to see how all the fields and conditional logic, calculations etc work to give an idea of what can be done. Given all the options available in this plugin and the types of fields (hidden fields, subtotals, js code, raw calculations etc) plus all the regular form fields it's difficult to say what can't be done with this plugin. Very impressed and would highly recommend