If your Windows falls over and dies, in a dual boot with Linux, you can always recover your windows-based data unless the hard drive itself has failed. It could save your a**.
It won't make your Windows faster, but it will never waste your time downloading the same automatic updates that failed last time, that you never wanted anyway, or leave you waiting while running malware and antivirus scans, or defragging.
It will never accuse you of piracy or nag you that you need to validate the OS before you can download some new application update.
It will not get slower and slower as time goes by, and you don't have to buy a new PC just to run the latest edition, or pay money to upgrade - it just downloads and installs the new kernel and system files when you want it to, or not if you don't. Most updates do not require a reboot, you just carry on doing what you were doing as it stops the old services and starts the new ones in the background.
It automatically cleans up the traces of the old version, leaving all your applications working like they did before, without having to reinstall, and leaving you with most of the disk space you had before. It also updates your applications in the same way.
It's a bit like the old broom that you have used for many years, three new heads, five replacement handles...
Yes, It's good experience to have, and it can download fixes while your Windows is sick and waiting for the knowledge of how to make it well again.
Alternatively, you can just boot it from a live CD or a USB.