'Obsession' was added to my garden in spring 2007. It's a sport of ‘Sparkling Burgundy’ and has slightly shiny medium green leaves with a darker green margin in a small mound. My 'Obsession' never became an obsession with me. My plant never showed any signs of the darker margin mentioned above - not so sure that's an accurate description. I divided it in 2012 and took most to plant sales but kept a couple divisions. One of those divisions I kept in a pot through 2015, but I found I still wasn't very excited by it and last autumn, I divided it up for plant sales. This one is now gone from my garden. If you've got good pictures please feel free to share them.
I no longer have this in my garden but in another discussion list, we decided that maybe it never was 'Obsession' after all, but rather, 'Invincible'. Would be the first time a mis-labelled hosta made it into a garden.