The original question on this thread was about other HA systems.
I have a WW system set up. Through it:
I have a SmartThings system. Through that:
My garage doors and exterior gates are monitored. I receive push notices/texts and the lights come on if any are opened. The rules and notifications are different if doors are opened when we are away, stay open past 9 pm, or stay open longer than 1 min.
Garage doors can be opened or closed remotely
My lawn sprinkler system shuts off if the weather forecast shows rain or snow within 1 day. It comes back on if clouds or sun is predicted. (Using IFTTT weather)
Kitchen lights come on if motion is detected in the kitchen. Shut off 3 min after no motion.
Exterior lights come on 30 min after sunset and shut off 45 min before sunrise.
Presence is detected through our cell phones. Different rules run when presence is detected or not.
Alert is sent if motion is detected on the front porch. Television changes to the security camera feed.
Thermostats switch from heat/cold based on outside and inside temp. Thermostats adjust based on presence and date/time. They run different rules in summer from June through September. On weekends and holidays the wake up rule executes 2 hours later.
Amazon Echo can control my thermostats, turn on/off television, change channels, change tv inputs, turn on/off lights, start/stop the sprinklers, and probably more that I can't think of. (Television control comes from the Harmony Home Hub. I control it through SmartThings, but you might be able to connect it straight to the Echo and control it by voice without SmartThings).
SmartThings had a few months of turmoil where time-based commands weren't executing. That led Bruce to give up on his rule engine app, Rule Machine. SmartThings has fixed their issues and a new app has been introduced called CoRE (Communities Own Rules Engine). CoRE seems to have expanded on Rule Machine and added the ability to make even more complex rules. I have migrated most of my rules over to CoRE, just haven't had the time or need to do the rest.
Overall, I am very happy I went to SmartThings a few years ago. Until WW allows for rules based on dates, time offset and delays, virtual switches or variables, weather forecasts (even if through IFTTT), and cell phone presence, then I am probably sticking with SmartThings. I purchased all Zwave devices that I believe should be compatible with WW at some point.
To be fair I haven't messed with WW cloud in a few months so I don't know what features have been added, if any.
What drew me to WW in the first place was the idea of Automation. Most HA systems on the market really offer just a glorified remote control feature. If you have to log into an app every day to turn on the lights or adjust the thermostat you don't have Automation. By installing sensors and allowing for complex rule building anyone can make their home function exactly how it needs to to fit their lifestyle. WW had the right idea, but is struggling with the execution.
IMO, they could make a big splash in the HA market with just the relay, if it ran software that could interface with other companies APIs, integrate competitor devices, access internet feeds, and had the complex rule engine.
Most people on this board want WW to succeed. It's a shame they don't meaningfully interact with us and use us as a resource.