New
#10
If this tool is intended to use for the "free Upgrades", then the only added value I could see in a special tool would be to automatically retrieve the existing product key before doing the actual installation. Today, you have to use the "genuineticket" method to do a clean-install (on a PC not previously Upgraded) and still reuse the existing product key. IF this automated that function, that would be worth having for folks not willing or able to use this other approach.
I would trust a clean install from iso long before anything MS comes up with. Who knows what it will carry forward from old OS. Clean install probably quicker as well.