I upgraded to a digital Stanley timer...so far so good. It accepts three prong cords. Easy to program, up to 8 progs. Havent seen it perform when power goes out but it has battery backup. I got tired of messing with the analog ones.
I highly recommend any timer with a battery backup. This way here you don't have to reset if there is a power outage. The Stanley digital ones are good. Replaced the three i have on my tank with them a few years ago. They are a bit more than the analog ones, but worth it IMO.