$70 for a technician to come out and tell me there is something wrong with my sprinkler system? Humm the sprinkler system that I am calling about myself. I'm ok - I will go to the numerous other companies that will give you free estimates before they start work on your property.
It's very rare that a company wants to charge you for a estimate. When they do it sends up a red flag to me - greedy. If you have a good product and do good work it sells itself you don't have to charge for ridiculous things like a estimate. By the way whenever anyone has anything done to their house if they don't get a estimate they are not doing their homework.