Disclosure: I do not work for ZenScreen, nor have I been incentivized for this review.
I have been using ZenScreen for a long time now as a volunteer tester (previously iOS, now Android and Chrome extension). I do not have kids (does my cat count?): I have primarily used it as a way to see my own device usage (apparently I use Reddit more at night than I do any other app combined on my phone during the whole weekday - 2nd close is either Spotify or GPM depending on the day).
I like the extra focus on simplicity in the app. Instead of telling me the top 20 apps I use daily, it focuses on the top few most-time-consuming ones. While I also use the Chrome extension (home & work), I realize I have more control over what I can do in my mobile usage than my laptop/desktop usage (which is a different topic).
I would love for some regular reports or syncing with other health trackers, or syncing with Google Fit & Apple Health somehow. For example, if in Sleep Cycle I note that I didn't sleep well, I would love to go back regularly and check if MyFitnessPal shows I ate junk food more during those days and if I was spending too much time during that week/time-frame.
I would also like for it to, optionally, alert me if I don't open the app for a few days. Sometimes I forget to check the usage for a few days in a row. Suggestions would be great also ("Hey Agha, you're on Reddit every night for 2 hours. How about reducing it to 90 minutes three times a week?").
Overall, I like the idea and the features so far. Looking forward to using this further going forward (please bring a native Win or Mac app).