I'm not convinced they ever actually did anything. I finally canceled after a bill showed up stuck in my door when I returned from a 10 minute walk with my dog (and they weren't there when we left for the walk). No pest control service can spray around the entire outside of your house (and do a decent job), write out an invoice, and be completely gone in under 10 minutes.
Oh, and them "spraying" never put even a slight dent in the bug population.