What's the real deal?
We all know the "old" VA11A doesn't play well with Vista. Some folks are able to "get it to work" by editing the "ini" file, but for most of us, it's a wait for X10 to update the drivers kind of thing.
The X10 Wiki, module documentation, and even the driver installation apps all refer to a VA12A - but with no data as to what it is or why it's even in existence.
General opinion is that it's the Vista-compatible VA11A video adapter. So I asked them. The answer was/is that YES it's Vista compatible, but so are the newest VA11A's!!!
Huh? The newest VA11A's work with Vista? "Yes", was the answer. Upgrade price is $10. Send your VA11A back (get an RMA) along with $10+shipping and you get a "new" VA11A that is supposed to work with Vista.
The NEW VA11A's and the VA12A's (when they're available) sell fro $59 - hence the $10 up charge.