I've had a few exterminators treat homes I've owned over the past 18 years. Last year we had ants show up out of the blue, and they wouldn't go away! We tried everything, including 2 exterminators, neither of which could eliminate the ants. We called Bulwark based on their guarantee, and sure enough, those ants are gone! We haven't had them return 5 months later either! Really, really great service and proven results.