Picked up IronXL as a replacement for Syncfusion due to its more appropriate licensing models. Was pleasantly surprised how easy it was to use and it's always good to see full .NET packages without Windows dependencies or interops. When I ran into a bug, the support team was able to identify the problem and release an updated NuGet package quickly. Review collected by and hosted on G2.com.

Granted I haven't used the library long enough to know its full features, but it seems the package could do with more helper/extension methods to support common simple tasks. Like importing collections of objects to a sheet or calculating ranges based on indexes. Review collected by and hosted on G2.com.