Mark Wilcox with Martz Brothers has been treating my lawn for about 20 years. One year I did try a different company and they almost ruined my lawn. That was back when Mark was with Green Valley, so I went back with Green Valley. Then Green Valley was bought out by Scotts and changed all the chemicals they used. The new treatments didn't work near as good and I was ready to change. Then Mark started Sterling Lawn and went back to the original chemicals. Then Sterling Lawn merged with Martz Brothers. One thing I'll say is Mark understands lawns and what they need. He also understands what chemicals work best. He's not interested in using the cheapest chemicals, he's interested in what works best on lawns. That's why I'm sticking with Martz Brothers as long as Mark Wilcox is with them. Thanks Mark for keeping my lawn the envy of my neighbors.John S. in Shawnee