As a developer i use it extensively for sharing ideas specially related for system design and application flows. Entire team finds it comfortable to use it, understand it and make changes swiftly. We use it for High Level System design. While discussing the only missing thing we find about it is the integration of an ide for Low Level Design but in my opinion this tool isn't made for that purpose.
They are always very helpful, we get computers every two years and I have to call them to move the license from one computer to another and they do it with a smile in their voice!
As noted in first question, SmartDraw has them beat in every category I can think of (except for price; but need to keep in mind the old adage "you get what you pay for"!). This product allows for VASTLY-improved uploading of data than the Lucidchart product, and customer service is real, tangible service... they understand that when you have a question and need an answer, waiting 2 or 3 days for an email response is not acceptable.
SmartDraw has provided good return for our internal purposes. Using it to understand an organization's structure and inner workings has been valuable. On the client side, creating steps and businesses processes has also been a big plus. It has helped decrease confusing reporting structures and has provided a detailed map for individuals to understand where they fit within their organization.
Unfortunately, SmartDraw has been somewhat inefficient with some of the more complex projects on our plate and has really deterred certain employees from even wanting to use it.