Our previous excel solution was feature incomplete - the reports that were generated by the excel export engine did not look anything like the reports we produced on the web. After switching to XlsIO we can produce excel reports that are nearly identical to the ones we produce on the web. Also, when we ran into a bug close to a release, the SyncFusion support responded quickly and delivered a hotfix within a few days, allowing us to release on schedule. I can really recommend this product and the company behind it.