I've been using it on new projects, but always found customizations a little awkward. Are you changing the actual bootstrap files (typography.less or whatever) or simply overriding them in your own style file?
I am overriding bootstrap.css. Which on hindsight seems like a bad idea. Now I am finding it a little difficult to migrate over to 2.0. So what I've ended up doing is copying over the new features that I want (like the new icons) and leaving the rest in legacy mode. No biggie. Dont really need a responsive design for this website.
I'm used to 960GS so I was at home when it came to bootstrap. I spent some time reading the examples provided, then started on a clean slate. Top nav, the mast then footer, then finally the main content. That way you are not technically tweaking their templates. You are branching out.
I've been using it on new projects, but always found customizations a little awkward. Are you changing the actual bootstrap files (typography.less or whatever) or simply overriding them in your own style file?