You don't even have to reinstall the OS. Just drag the demo programs to the trash and empty. Impossible on Windows.
I remember when my friend won a new Compaq laptop in a contest. It had Vista and so much crapware on it, it took about 5 minutes to boot with the inadequate amount of RAM provided. I offered to wipe it and install XP. It does install without drivers, but all you need is the ethernet driver and then you can go online and grab the rest. I had him set up in a few hours, booting in about a minute.