During the download part of the iftw installation, the progress bars only get updated when a cab file is finished downloading.  Some of our cab files are up to 2-3MB in size.  During this 2-3MB download, the progress bar will pause for a long time.  This is a Microsoft MSI bug that we have no control over.  We should have some text warning users about this.  
I just witnessed Microsoft's Windows CE toolkit install, and they actually add this text to the progress bar:  "Downloading files (expect pauses as cabinet files are downloaded).   We should use the same text.
###@###.### 2005-03-16 20:41:02 GMT