Make sure the NVOC employees understand their role. Do the employees understand what an NVOC does and what is required for your shipment? This sounds silly, but some NVOCs have exhibited an extreme lack of knowledge about shipping. It could be said that, "All they know about shipping is that the pointy part goes first." Talk to the NVOC's employees. Ask questions about documentation requirements, transit times and underlying vessel operators. A good NVO is there to serve you and wants your next shipment. The other kind just wants this shipment.