The quote below from the Paul Buff site should help your decision. I found it in the Technical Forum.
We are pleased to recommend our new authorized service and repair center in Canada, Service Camera Pro. Located in Quebec, Service Camera Pro is authorized to perform both warranty and non-warranty repairs on Paul C. Buff™ products. Using this repair center in Canada allows our Canadian customers to have quality service for their equipment without the added expenses and extended turnaround time involved in shipping the equipment across the border to our facility.