Installed on 2005 Chevrolet Silverado Z71. Installation took about 1.5 hours start to finish. The instructions were a little off, fortunately there are install videos from others on YouTube that help clarify. Remote start works flawlessly. The preprogramming and wire harness they do really helps take the guesswork out of the job. Separate you can buy the control module, bypass and installation extras for around $100, but it is worth it to pay the extra for the preprogramming, wiring harness and access to vehicle specific instructions. Remote range is excellent.