great, affordable option
I’ve been putting off installing smart switches, unable to justify the cost of installing so many around the house, and concerned the cheaper options wouldn’t cut it. I finally pulled the trigger on these, and couldn’t be happier. They’re simple to install (about 15min per switch, once you know what you’re doing), the Smart Life app is responsive and reliable, and with a bit of futzing, you can fully integrate with Smart Things, Alexa, etc. I’ll comment on a few concerns I had going in, based on other comments I’d seen before purchasing:Potential Concern 1: The device is too deep to fit well into the box. I didn’t have any trouble. I’ve installed two into a 2-gang no problem. My house was built late 70s, then extensively renovated in the early 00s, so I’ve a mix a shallow, 40 year old boxes and deep newer boxes. The shallow boxes were a bit of a puzzle to get the wires folded in well, but I got them all.Potential Concern 2: Wifi based switches are less reliable, power outages cause issues reconnecting, etc, etc. I have only had these installed for 3 weeks, but haven’t had any trouble. Note that I’ve repeated caused “power outages” by throwing the break switch while installing other switches, and they’ve always immediately reconnected. In the most extreme case, I installed a switch, then a week later replaced it with a smart dimmer from the same company and left the original switch on my work bench, then a week later installed it somewhere else–smart life immediately recognized the switch and everything was fine (though of course I then renamed it). If it can handled a 1 week power outage, I’m sure it will be fine for any real world scenario.Potential concern 3: Wifi based switches have too much lag. I don’t have any trouble with this. I have numerous automations in which once switch flips on many others (how annoying is it to always flip the same 5 switches when you walk into the kitchen? Problem solved!). There’s essentially no lag, provided your internet is reliable.Potential concern 4: Limited interop with Smart Things and Alexa. I do like the Smart Things app better, and I have some smart devices (notably, a Door Lock) that don’t work with Smart Life. But the internet is full of wonderful hacks. I followed one in which I set up a virtual switch in Smart Things, then used ifttt to have Smart Life switches flip the Smart Things virtual switch. That Virtual Switch implements the contact sensor APIs, and so can trigger Alexa, the door lock, whatever. It’s a bit annoying to set up, but provides infinite interop between Smart Things, Smart Life and Alexa, which covers just about everything. The main issue here is that ifttt has significant latency, so this only works for links that can tolerate substantial lag.Two Annoying Things:1) The switch doesn’t implement the contact sensor API Alexa uses. So you can’t trigger Alexa routines when you flip a switch. The ifttt/Smart Things Virtual Switch hack fixes this, but adds considerable latency and it’s annoying to have to do that.2) Smart Life has a limit to the number of automations you can have. I’ve no idea why, couldn’t find documentation of what that limit is, and it was annoying when I hit it. Also, the Smart Life app has some questionable UI choices that make it a pain at times to work with (at least on iOS).A final note: These are single pole switches, which means they’re not intended to replace 3 way switches. BUT, if you understand how 3 way switches are wired, you can hack two of these to serve as a three-way (or arbitrary-way) switch. The trick is to make sure both switches have a constant power source (ie, the Line). Often, one of the three way switches doesn’t have that, but you can use the Traveler to run power to the switch that lacks the line. Then chose one switch to be connected to the light via it’s Load, and cap the other switch’s Load. Finally, use Smart Life to link the switches together. I used a similar hack to change a three-way switch in my kitchen so that the switch by the door to the garage acts as a master switch that turns on all kitchen and dining lights. As a matter of cost, this is significantly cheaper than buying two 3-way switches, but more expensive than using a single smart three-way switch and leaving the other dumb.

Product works but setup includes a bit of discovery to get things working
For context, I have experience in both home electrical and in networking. I bought a four-pack and have successfully installed/registered two of the devices (not sure yet what I’ll do with the other two) and have successfully created both manual and automated tasks to control both devices.Electrical installation went smoothly with no issues regarding the devices. After connecting them electrically, I could successfully switch the related lights on and off manually. The only thing that presented an issue is that the size of the device container and the amount of wiring in one of the locations made it difficult to find a way to make it all fit. (Not an issue, only a consideration as you think of where you’ll put these.)Registration of the devices went pretty well but there was a bit of discovery to get everything working:1) The version of the Smart Life app I installed on my phone didn’t fully match the instructions that came with the device — the instructions indicate to select “wall switch” but the app did not have that as an option, only various “switch” types. For these switches, I was successful using the “switch (wifi)” option.2) The device has to be put into registration mode and it can be difficult to determine this from the device. The device has a white LED that is on when the light is off, off when the light is on. When the LED is lit, and you try to put the device into registration mode, it is difficult to tell whether this happens. The white LED hides the flashing red LED. I found that turning off the LED (turning on the light) at this point helped to clarify when it was in registration mode.3) The app/device didn’t do a great job of providing feedback during the process so it wasn’t clear if it was succeeding or not — while the app displayed a percentage complete circular progress bar, it also displays three items status levels at the bottom of the page (I neglected to write these down but they are like “device found”, “registering”, “complete”, etc.) but these never change status. I found that I had to just wait while the process continued and at one point the flashing red LED will go off and the progress bar will continue for a bit longer and then the app informs you the device was successfully registered.4) Your phone has to be connected to the same network as the device in order to successfully register the device. This may seem obvious but if you are putting the device on a guest network (highly recommended that you do this), then your phone must also be on the guest network in order to register the device. Once registration is complete, you can put your phone back on the main network and you’ll be able to access/control the devices.5) In creating events to control the devices, there aren’t very good instructions on how to use the various conditions, etc. For example, there is no “duration” setting, only specific clock times. However, I was successful creating an automation event that turns on my devices at Sunset for my location and then a separate automation event that turns off the devices at a specific clock time (10:30pm).