The client I'm working now is also using the SyncFusion Essential Suite. We've mostly used the Excel and Word IO libraries, of which I'm prettuy satisfied. They also provide a number of ASP.NET Ajax controls, among which a very extensive DataGrid. This offers quite a lot of features but unfortunately doesn's perform that well. All in all, the pricing is a little bit cheaper than the Telerik components, that's why the client decided for it in the end.