Thank you for the nice words about our RadEditor for ASP.NET. Indeed, we also believe that this is the best HTML editor for .NET on the market - it took us good 5 years to reach this level of excellence.
It seems that you found the forum post where a Telerik WinForms editor is discussed at length: WinForms Applikation with RadEditor
. We just replied to your comments there and I am not sure there is anything else that we can add at this time.
Currently, the HTML-like formatting does not support backcolor and strikethrough, however, we are constantly working on improving the functionality and your feedback is much appreciated. We will put your suggestion in our TODO list for our future releases. Note that we have received many more requests for paragraph indentation, lists and hyperlinks and we will probably focus our immediate efforts on these. Thanks for your time and do not hesitate to write back if you have further questions.
the Telerik team