I think it's always better for the customer to have access to the code inside. I'll actively recommend FLOSS solutions to customers even if they're not quite as good as the competition on paper right away. Simply because a large part of the cost of industrial hardware is actually supporting it for a long time. And support is SO MUCH EASIER if you have all the source code and schematics. Of course big customers get to demand this kind of arrangement (floss, escrow, or even just "give us all the paper") while small industrial operations end up paying a premium for inferior service.