The Daily Rider in Washington, DC had a lot of complaints about Rad Power bikes and their build quality. Big caveat here is this shop deals with two of RPB's competitors, Tern and Yuba. That said, I do know that broken spokes, especially with the RadWagon has been a problem for them. Curious what everyone thinks about this.
http://thedailyriderdc.com/thinking-of-purchasing-a-radpower-bike-read-this-first/
http://thedailyriderdc.com/thinking-of-purchasing-a-radpower-bike-read-this-first/