I’ve used Syncfusion’s Essential XlsIO for over five years now and I’ve introduced it to every client that I’ve ever worked with. Without exception, they all love this product. I build reporting solutions frequently and my experience has been that most users want their reports presented as a spreadsheet with live formulas to allow them to perform “What-If” analysis. XlsIO allows me to provide this in a thin .NET layer that is blazingly faster than initializing Excel itself. My timing studies show that it is at least 100 times faster. XlsIO allows you to create centralized reporting systems that execute efficiently in an easy-to-learn object model. This tool has become the basis for all my reporting solutions.