I am always reluctant to use Netadvantage for ASP.NET controls when there already exist the same controls in VS2005 (i.e.: gridview, panel, tab). Although Infragistics controls are easier to use and has plenty of formatting options, the load that these controls add (JavaScript code in the resource file and styling images) push me away. I am not sure exactly how much it would increase the loading time or it would be noticeable for the user.  I hope I am wrong