Use someone who cares about your lawn, not your cash. They will try to auto-renew you based on the back of a piece of paper left at your door or an email. Unlike professionals who you retain for a specific service, they retain you for as many services as they choose and try to keep coming back until you tell them to stop. Continuous Service = Stay Away.
Quote from Weedman: "We do not require a signed contact [sic] to start services, since we are a continuous service company we automatically have an order in place and ready for our customers from year to year unless told otherwise."