After 11+ years my Liftmaster drive sprocket sheared away from its motor. Liftmaster recommended I contact Kaiser. I called them at 9 AM, and had an appointment time set by 9:15 AM. The tech showed up around 12:15 PM the same day, and by 1:45 PM my door opener was as good as new. Around $45 for parts, $125 service call fee, $172 total after tax. I cannot be more pleased. This is the best and most rapid customer service I have received from ANY vendor in, at least, the last 3 years. PLEASE consider giving them your business!