GM crops have provided the same advantage to the grower no matter what your growing or where your growing it. It gives the grower the advantage with weed control which translates into allowing the grower to manage the land in a more efficient sustainable manner.
Since we started using GM crop on our land in the late 90's our fuel consumption has decreased by half, our land has never been in better shape. Life has returned and which has rebuilt our soil structure, we are building soil every year now as opposed to eroding away. This is a direct result from cutting back on our tillage.
This is a direct result from using a RR cropping rotation in our fields. Its not all no till up here, Id call it minimal tillage