This is by far the very best component for dynamic Excel Spreadsheet generation on the market. Our company has tried several alternatives, but nothing compares to the ease of use and performance of XlsIO. For programmers, usability is similar to using the Office11-Office14 references in VB and C#.NET programming, except SyncFusion has found a way to make it even more intuitive and faster to work with. In fact, some functionalities are easier to do with SyncFusion's XlsIO than VBA in Excel, and the fact that they support all formats 2000-2010 was extremely helpful to our clients. The XlsIO code is ready-to-go for generating virually any file and sending it right into the reponse stream! SyncFusion's tech team even helped walk me through getting everything set up, and were very friendly and helpful. 5 stars!