What's so great about Guardian is that their ad tells the truth. I found them in the yellow pages because I was desperate to find a trustworthy exterminator. I called the Chicago number and Nathan came out for the consultation. Punctual, highly knowledgeable and honest about the problem, Nathan explained everything and then after getting the estimate, service began. Technicians (John primarily) were punctual and left evidence of the service. Guardian took care of my squirrel and bee problem I'd had for years. Guardian provided the best exterminating/pest removal service I've ever had and what a relief to have an exterminator you can trust.