If he's happy with Ubuntu Unity (I'm happy with it too; I'm also happy with GNOME Shell which I'm currently using), let it be.
Of course, I'd like to see him try out GNOME 3.10 since some of the GNOME 3.10 applications are Mac-like, but Michael would do just fine with Ubuntu. I mean, if he's okay with Ubuntu, the more the merrier. I will look forward to try out GNOME 3.12 when it's released. It would be cool to see what the new video player will look like in my system.