Headway is a groundbreaking theme with it's visual editor.

It's weakness relates to image centric/portfolio usage. The photo gallery has been removed from the core in 1.7 but available as a plugin. But it's so basic it renders itself almost useless.

There is a huge community of photographers who need more versatility and customization options for their portfolios. Hoping that something more advanced can be added to the core without needing to use a plugin like nexgen.