Once you get used to the hard-to-see arrow that points to the actual time, and get used to estimating the actual time based on the hard-to-see division lines, this timer works like it should--but only if you're used to the type of timer that has little thingies that you push down or up, depending on when you want the timer on or off. I am familiar with them, so that was not a problem, but I think it might be for someone who had never used this type of timer before. The pro's are that once you get used to it, it's simple and reliable, which is exactly what I want in a timer. It has a minimum of moving parts, and a minimum of electrical parts: two--the on and off switches, which are manually set, even if you don't know that's what you're doing. So for people like me who hate complicated electric timers that have to be re-programmed after any blip in the electrical system, this is perfect. It gets three stars because of the difficult to see working parts, and the fact that there is virtually no manual that could illustrate where to find the virtually invisible time-setting arrow and how the whole thing works, for people unfamiliar with this type of timer.