@adric22
It's used to attach multisync monitors like the C=1950 to the Amiga's 23 pin video out. Not everyone needs/uses it. I warn against it simply because it's tempting to try and use a 15 pin VGA connector, as those are still made. You're far better off cutting two pins off a 25 pin connector to make it fit the 23 pin video out.
One of these days I'd like to etch out an internal video slot PCB and attach the Neobitz parts to it. That'd be so much cleaner.