Not only does it work, it's by far the safest herbicide we've used so far. People love to complain about herbicides, pesticides and fungicides, but they're the same people who would complain if their food was suddenly 8x the price because farm yields would go back to the pitiful amount it was before we had these chemicals.
I've worked in agriculture for a couple years while doing my Biology undergrad. People who used chemicals had a HUGE increase in yields vs others.
Be thankful we're not longer using things like Agent Orange and DDT.