It drains the batteries every 3 weeks. Awkward programming. You don't know when it will work. Overall, I wouldn't buy it again.

Programming is completely inconvenient. You cannot set the time for watering. It starts at the time you program it and simply gives you the option to start a few hours later by pressing a delay button. There is also no option for manual watering by setting a watering time. You have to set it to water and wait to stop it. Not convenient at all.
The build quality will show over time.
I bought it because it is dual, but with such inconvenient programming, I would not buy it again.
EDIT:
After about a year, it proved to be completely unreliable. And at one point, when we happened to be away for 4 days, one outlet did not close after watering, it remained open with all the implications that entails.
What a shame!!!