Those of us who use our bikes as transportation are pretty used the "How do you get groceries? How do you ____?" questions. On a regular bike with some modest cargo provisions getting groceries for a single person, or even two people can be done, not always easily. The Xtracycle makes it easy, even for a family or four or five. The Xtracycle pushes the range and use of the bicycle to point that it makes living without a car a viable option for a lot of people because it removes what for many people is the last hurdle to using their bicycle for an overwhemlming majority of their transport needs. Most people don't regularly carry more cargo than they can carry on the Xtracycle. And that includes the number of children in the average family. Carrying two children is very, very doable on the Xtracycle. I do so regularly with Silas and Zoe (who stays with us three days a week while here mother goes to work).
My experience is that people in the US who use their bicycles as transportation start out with one or a handful of bike trips. They might commute to work first and use the bike for nearby errands. Then the expand their range. They they might add some cargo capacity. Many, like me, relocate their residence so that they aren't in a suburban environment where zoning produces a great divide between residential areas and commercial/service destinations. Sometimes a tipping point is reached and the bike is, except in very rare instances, their mode of transport. The Xtracycle is a great help in getting people from "I can use my bike for some trips" to "I can use my bike for almost everything."
Oh--the plea. Almost forgot. If any readers would like a FreeRadical, Surly Big Dummy, or Xtracycle Radish, please let me know. We would very much like to be a full fledged Xtracycle dealer (we can presently order FreeRadicals and limited accesories from QBP), but Xtracycle has changed their distribution rules this year, and to have full dealer status a shop has to meet an opening order minimum. This is kinda hard for a small shop in a smallish town in an obscure location that doesn't depend on foot traffic for business. Because of our present location and business structure we can't just buy a bunch of these, put them on the floor, and be confident they'll sell. So I need to pre-sell some some Xtracycle stuff to be in the position to place the opening order.