Oh. Damn. I think I could use one of those, I recently got a Huion Kamvas Studio 22, (it's a tablet PC) and I wanted to use my other PC as a camera for drawing videos. Since I only have enough desk space for one keyboard and mouse at a time, I think the Tabmate would work pretty well as a stand in for all my shortcut keys.
I'd be interested to know how well it works for ya.