It’s too late, I’ve already converted to a competitor that cares about its cross-platform reach:
I’ve pre-ordered the Eye Tribe gadget, I think those guys are more ready to take a problem on like this effectively. It is for both UNIX and Windows, as well as having a tablet friendly solution.
The problem is that Tobii’s background is in specialist devices, and so they’ve never needed to worry too much about being Windows-centric.
Now it seems that approach is their undoing, because if there’s one thing you need to be prepared for when going mainstream, it’s market reach and device compatibility.