Yes, it's a wheelchair on tracks! I work with someone who has MS; she's not confined to her wheelchair, but her ability to locomote is painfully restricted. I can just imagine how freeing it would be for her to be able to go where everyone else is going. It really moved me to see the Tank Chair's first user (the creator's wife) bombing around in the snow with her family.
My two legs work just fine, and I want one!