Bought from Mauricio but haven't been use as my daughter isn't keen on biking.
I'd refer to his original post here for description:
http://www.geekzone.co.nz/forums.asp?forumid=77&topicid=173821
The wheel itself sell for GBP 119 now. Asking $100 for it (comes with US charger, works on 220v).
Pickup from Auckland. Add $20 for shipping outside Auckland.