Speaking of DD - did you know that there is a very significant number of wheelchair users that can not have a power wheelchair because of neurological issues, or mental or physical limitations. We're talking about people with MS, cystic fibrosis, Parkinson's, paraplegics.
The GeckoSystems robotic wheelchair is going to give a lot of disabled folks freedom that they could never experience without it.
I don't know about you, but the idea that I own part of a company that can do that gives me the warm fuzzies :)