I bought this to replace a three-year-old Hunter sprinkler controller that died after only three years. I "glanced" at the instructions for about two minutes (really easy to follow), and installed it. Total time from out of the box to in place and running my sprinklers was about 20 minutes! And I'm not a tech genius. I'm 66 years old and wear bifocals! Programming of this controller is super easy and intuitive. Most people could do it without even looking at the instructions. Another feature I really like about it is that you can run a complete cycle (water all zones at the programmed time) with the push of one clearly marked button. With my Hunter, I could only manually water one zone at a time.