Had a service technician come to re-install sensors after windows were replaced. First, he tried to tell me it couldn't be done because the spacing was too tight, and then tried to upsell me on a new alarm system. Then he broke a window lock (which we had to replace by filing a warranty claim with the window company). Then he couldn't figure which wires were the correct ones for a couple of the windows. In all three cases I had to troubleshoot the issues myself in order for the service to be completed. They gave me a measly 10% off for my troubles. Will never do business with them again. On the plus side, the service tech was very apologetic and polite, but that's about it.