And for people who are still concerned (and even though this is mentioned directly in the post - some people won't necessarily read it). There is a theme provided, which I personally think improves on Bootstrap 2's version.
The subtle color enhancements are nice (nothing like lowering contrast to make things look classier) but the button hovers appear broken.. that was an important bit of sparkle in twbs2 I hope 'twas just an oversight.
The hovers work, but they are so subtle you will barely notice it. I had to get very close to my monitor to notice on colors other than the default greyish white.
You can see a slight darkening around the edges; it's easiest to see on the default gray button. I agree: this needs to a be a stronger indicator.