Non-GMO Project Technical Administrators (the verifying companies)

Hi all,

To get the Non-GMO label In North America, we need to submit our application to one of the four Technician Administrators, and I'm wondering if anyone had any experience with any of them? I appreciate your input :)

They are:
NSF International
FoodChain ID
SCS Global Services
Where Food Comes From

Thanks,
Xiaoqin