I have to buy two tap timers and so far they are easy to install but all of them get very bad review. The only one I myself had no issues with is 'hoselink' available in Australia, but it does only intervalls which might create slug and disease problems. From a personal experience I know that the brand orbit is crap so is hohlmann, both start leaking after a very short time.
What I want is quality. The other system with the valves and the timer indoors seems to be very cumbersome to install and is expensive.
The best ones are going to be designed for hard pipe watering systems, these have multi pipe valves available and fully adjustable timers so you set the time on and time off and can do several cycles in a 24 hour period.
The draw back is that these timers are hardwired, not spring or battery operated.
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Acetylsalicylic acid is aspirin. This could be handy too: