Third PartyTPWorflow application and wM Workflow interaction

Is anyone using another workflow application for human interaction instead of the wM workflow product. Are you using the TP workflow product exclusively for all human interaction or for some human processes and using the wM workflow product for some.

Our enterprise workflow application don’t support too many of the open standards that we were looking for and integration with wM would take more of an effort than we would like. So we are in the process to decide how both application would interact with each other and I wanted to know if anyone encountered the same scenario.