Works nicely, but beta needs some tweaking. From other reviews, people are having similar problems, but here are some tips on getting it to work reasonably across the browser spectrum, or at least Niftybox (haven't used niftycolumns yet)
- Using color numbering (eg #000000 for black) works in Firefox, but not in Internet Explorer.
- Colour names work in Internet Explorer, but only basic colour names (blue, green, red etc) work in Firefox, and not sub colours (blue1, blue2, blue3).
- So, using basic color names works in FF and IE, otherwise, some colours won't show up.

There was also an intermittent issue I had with the niftybox mambot working in some articles. Eventually by cutting and pasting the code several times, it work on all the articles I applied it to.