Make building workflows easier
I have been using Nintex for over two years on my current project and it has greatly increased the speed to deliver simple and complex workflows to implement business process. We use the webservice to publish workflows based on the Nintex nwf files to build repeatable solutions. The support team is quick to respond if you need help and their online site has good documentation and examples.
Lots of activities covering most scenarios
SDK eases workflow provisioning and allows extensibility
Multiple scopes for customizing templates at farm, site, web levels
Graphical displays of workflow progress