Conclusion: There is simply no other tool out there like Visio. There are some cheap solutions that try to do the basics, but Visio really takes it to a level that really sets it apart when it comes to multiple categories of visualization and illustration. Visio 2010’s major strength is its automation and ease of use in addition to its support across a wide variety of scenarios, which includes organizational and networking making it a powerful tool for a variety of scenarios.
Pros: Support for Office Ribbon, Improved productivity with Live Renderings, Improved Accuracy when manipulating, adding and snapping shapes, Better organization and welcome tools for dressing up flowcharts, Improved integration with SharePoint and third party products such as AutoDesk AutoCAD
Cons: Importing complex AutoCAD drawings can result in large files and it lacks some elegance when drawings show up on a page .dwg drawing is very small on the page making it hard to find initially.