TruGreen didn't kill my weeds (had some violets, hard to kill) but in the process killed my entire lawn. Before they killed my grass, they drove the heavy spreader that they ride around on my lawn and there were permanent tracks that were discolored until the whole thing died.
I changed grass to zoysia, and now use a local guy who's doing a really good job. I don't have a single weed in my yard right now. Six applications at $52 each ... not bad. At my request, this guy doesn't use a riding spreader ... he uses one that's worn around the neck and refills it several times.