After 2 month of riding on Halfbike, I can fully recommend it - it's a great vehicle bringing a lot of fun and workout.
Learning curve for me was not that bad but initial surprise that it's something else then standard bike was there.
It's so light and small that you can carry it to pubs, restuarants and office.
Thank you guys for creating such a toy for a 40 years old kid like me.
(my kids love it too)