Windows Easy Update Cable

Could someone please let me know if there is any value in purchasing the easy upgrade cable MS offered when Vista was release (ostensibly for XP users going to Vista)? Will it make the process any faster for me when upgrading my 3 PC's from the RC to Win 7 Pro (2 had Vista Home Premium previously, the other XP Pro SP3). If the cable will make things any faster then I'll buy one, if not then I won't... Help is appreciated...

This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.