Purchased on a NZ auction site, had been looking at loads and bought one thinking it was another.
All set to deploy a 512MB Pi onto a mount I'd made, and it had no mount holes - uh-oh. Boot it up, 256MB - uh-oh.
I must have had Pi blindness, because I went back and checked, and found the Pi was not advertised as 512MB or latest rev.
Nevermind, I have a few projects in mind that it will be fine for (PBX, XBMC etc).