Honestly, the part that I dig the most is the tactile overlays. Interesting concept, but too limited for me for the price. That being said, I'd buy the heck out of a $15/$20 overlay that gives you the tactile sensation, but using my Tablet of Choice as a controller. I've seen them for keyboard replacements for the ipad; unsure what else is out there.
Haven't seen it, but if you make a repro script I can test it out over here.
You have mail.