We love the balance of drag-and-drop connections with full scripting/programmability. We need it to be usable for developers, support staff, and professional services; and it has that flexibility. We also love that we can write custom nodes in .NET.

The fact that I can rapidly prototype integrations

The possibilities for integration are endless. I have not yet encountered an integration scenario that could not be achieved with Flowgear. The design surface brings one as close as one can get to "coding without writing code". It's cloud-hosted. I don't need to install any software in order to design workflows. Their developer support is top-notch.