Don't bother with them....
Following the advice of my neighbor (who worked for Scotts), I spent a 2 years getting my front lawn in great shape - it looked like a Scotts commercial. I spent another year working on my backyard - turning it from a sea of weeds to beginning to look like my front.
I did the math and found that TruGreen would be only slightly more expensive that maintaining my lawn myself - without me having to do the work - so I gave them a shot. I called TruGreen - spoke with Jason and he came out to survey my yard and speak to me. I told him my expectations for my backyard was to be weed-free till the fall to plant, and I would hold them to their TruGreen guarantee and call them out repeatedly. He agreed, told me to call his number, and I signed the contract and paid upfront for a discount. TruGreen came out a few days later to apply lime and sprayed for weeds shortly after that - off to a good start.
A couple weeks later I called Jason and said I still had weeds that were not dying. I was told that someone would be out in 3-days. No one ever came, but when I called back - I was told they were out. I said it needs sprayed again then, and I was told they would be out again, this time my wife was home when they came - she said he was there for 5-minutes. After taking care of my lawn for 5 years, I can attest to the fact that 5-minutes is enough to pull a couple weeds, pull out a hose to attach to a sprayer, or open a beer.
I called again and again and again - to the point I was extremely frustrated and gave up on them - I started spraying my lawn myself. I eventually got hold of the regional manager who did not want to spray my lawn, but did agree to seed and aerate for free. I cancelled my service then and there and told them to never call me again. A year later - I have been called 3 times. Each time I tell the poor soul on the other end that I feel sorry that they get to hear me give them a 10 minute story about how terrible their company is at doing their job.
It took me a year to get my front lawn back up to par, and it will take me more to get my back yard looking OK. I am so still mad at TruGreen...