Art has been great helping me with a mouse problem. He answers my unending questions gladly and is clearly very knowledgeable in his field. I have a tiny crawl space for a basement, kneeling room only, and he doesn't complain about having to go down there. He also pointed out a leaking issue I have with a drain pipe and he sealed nearby entrance holes while basically laying in mud - all with that friendly smile still on his face. I trust Art and Permakill implictly and have recommended them to my neighbors, who now use them.