Infragistics NetAdvantage 2004 is a quality product. I have had no problems using the controls in a Managed C++ application. The controls are powerful and flexible enough for the requirements of my project. The documentation is adequate but could be better. Most controls are easy enough to get started with; without much learning curve. Its Toolbar Manager control is one of the best implementation of the MS Office 2003 toolbar UI. I like its Appearance object and its embeddable editors architecture.