Well gee I'm not sure, I used to work at a lab that grew genetically modified algae to be used for biofuel. So I feel like I know a thing or two.
But if you're going to ignore the literally best example of a GMO, round-up ready soybeans and corn, then what are we really talking about? You're talking about some futuristic, they could make the best plants in the world nonsense. That isn't what they're actually doing, though. Maybe that stuff will come later, if there is enough profit in it - but I'd imagine it would be expensive, since they're cutting off their own sales for round-up. That's the kind of stuff you get with monopolies; progress becomes limited when conflicts of interest arise.
But that is not what we have here in the US. We're using round-up, and a metric fuckton of it.