The print on the timer is very small, and the am/pm designation to the LEFT of the time is very hard to see. Eventually got it set. Hope I never want to change it.

Programming this is a little awkward (save the instructions, you'll never remember how to do it otherwise) but otherwise it is exactly what I wanted. I bought it so that I could set the whole-house fan in my new-construction home to run mostly at night during the summer and mostly during the day in winter to avoid pulling in excessive hot/cold air respectively -- the builder had just installed a simple on/off switch with instructions to leave it on 24/7, which hasn't really been necessary from an air quality point of view. Installation is pretty much the same as any other switch, only basic electrical skills required.