Had my Markilux blinds for a long time and they needed some attention. Contacted SBI and sent some photos. They were very knowledgeable and friendly and we agreed on the work required. They sent a couple of experienced engineers who serviced the blinds, replaced the motors, sensors, and controllers, and updated the wiring. Blinds now operate as new and are guaranteed for 5 years. Would certainly recommend it for new or existing installations.