Hi I have a Dell USB Pen with Windows 7 HomePremium on it.They are very good when reinstalling your operating system,It helps you backup all your important files and your drivers. I found it very helpful the only problem I have is when I upgraded my xps15 to a Alienware M17X R4 I upgraded my operating system aswell to windows7 Professional so I could take advantage of the 32gb ram. So now I have a Dell USB Pen that is of no use to me at all,I was hoping someone on this site would like to exchange a windows7 pro pen Drive  for a home premium USB Pen if someone has downgraded and is in the same situation as me please message me and we can help each other many thanks for reading and hopefully helping