Also https://lowpi.com is using nodebb for the forum section and its rocks.
Price comparison site https://lowpi.com
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RE: Who is using NodeBB?
I just added nodebb to my site: http://lowmyprice.com that is a site to find the best price of a product in Mexico. I think nodebb is a great forum system.
I also had worked with other forum systems like: phpbb, vbulletin, vanilla, smf and others, but i really like the simplicity of nodebb. We moved the site to https://lowpi.com
I'll try to make more modifications in the theme later!