if you already own windows then perhaps none. But obviously its free and not $90 - $120 for the operating system (( yes,yes we know everyone pirates windows ))
also ultimately given the customization that has taken place on this distribution which actually seems quite extensive and even has bugs fixed that they will pass onto to the rest of the linux community it means that the OS is rapid fast with very little 'meat' to slow it down. We all know windows is very fast with an SSD but often there is so much extra on there that you just dont need for a gaming platform. Look at the services running now on windows and their constant cpu battle half of them are there to protect from intruders and create excessive internal DRM on its own kernal, the other half are from bloaty applications and drivers that are not optimized from main vendors because the culture of closed source hasnt driven forward the idea of the clean and efficient.
in laymans terms its free and faster. Its also ready to run at the same or greater productivity levels of windows. People talk photoshop and in time im sure it will migrate but GIMP is equally good enough for 95% of users. All other applications from 3D rendering to music production are pretty much sorted and again most are free and fast.
So perhaps the benefit is towards expanding the community of future PC users and not the existing user base