Contracted them in the Spring of 2009 for exterior and interior pest control. Every technician treated something that the previous technician didn't treat. We saw more pests inside the house during our contract term than we had in the previous three years living in our house. We never could verify the exterior application was completed when we weren't home.
We got better results using a product from a home improvement store for much less than one of their treatments. That product reportedly last 12 months inside vs. Preventative Pest Control needing to return ever other month.
This was the worst service contract I ever signed. I don't recommend their service.