SQL server 2008 R2 setup - feature installation, side-by-side support with previous versions

Here is a setup based question raised in my recent SASSUG usergroup meeting when specifying about slipstream installation during the installation of SQL Server 2008 R2. Once you click on Setup application and pass through the screens with default &amp; input values until the point you reach SQL Server 2008 R2 setup - Setup Role screen. You will be presented with 3 options (see screenshot below): SQL Server Feature Installation - where you pick and choose to install SQL Server Database Engine services...(<a href="http://sqlserver-qa.net/blogs/x64/archive/2010/07/02/9193.aspx">read more</a>)<img src="http://sqlserver-qa.net/aggbug.aspx?PostID=9193" width="1" height="1">