We are only part way through the process of eliminating the problem we have with raccoons in our chimney. Thus far, we are pleased with the progress (one raccoon has been caught already), and the technician from Waltham Pest Control has been knowledgeable, experienced, friendly, courteous and efficient. He also warned us of his late arrival at the first appointment, and was right on schedule for the follow-up appointment. Presumably the rest of the process will go just as well, until all the raccoons are removed, and the chimney has been modified so that wild animals and birds, etc. can't get back in.