We've used a similar corner shelving unit to create space in a small 7 by 9 ft room. It's a great, easy shelving solution for small spaces (although installing it was a bit tricky as the walls weren't plumb.
This is a genius idea. A chair/ bench that can transform into a table, or both! This would be excellent to use in a smaller space where having multipurpose furniture is key to a functioning space. Or an outdoor space.