Have been very happy with service provided by this company. EVERYONE that I have dealt with has been professional, friendly and polite. Information for upgrades and add-ons has been provided, but never any pressure to buy. To my knowledge they have never told me I needed something that I didn't. I have a family member that used to be in the industry and they have always confirmed the accuracy of what Interstate employees have told me when evaluating our system. Again, very pleased with the service provided.