I had a couple of Kasa's external smart plugs, running my lights for my deck and gazebo. I got these switches to put on my exterior house lights so that they would come on at sunset and go off at sunrise.
My house was built around 1990, and back then they ran the 14/3 wire to the light and 14/2 down to the switch. I had to use the bare wire normally for ground and hook it up to the white wire at the light so that the switch would have the necessary wires to operate. It seems to have worked and I no longer need to switch my exterior lights on/off by hand and will start saving electricity as well. I could see adding more Kasa brand smart iOT devices to my house in the future.

I have been using Kasa smart switches & outlets for the past year or two. I have about 10-12 devices. I find them to be very easy to install & they integrate seamlessly with Alexa. Actually; automatically even. I never have to do anything. During the initialization process on the Kasa app, I always get a message saying that Alexa has recognized the new device and added it to my smart home device list. After that, I really never use the Kasa app again, I do all my routines and automation, etc, from within Alexa. On the few times I have lost power and/or wifi, my devices have automatically reconnected without a problem.

I have a whole house attic exhaust fan that I have been running on ancient X10 smart home technology. I wasn't sure how this switch would work with the fan, and to complicate things, the fan had a 2-speed rotary wall switch. I didn't care about the 2-speed as we have never used high anyway (I think it would suck the screens out of the windows!) so on the Kasa switch I just hooked up the white common wire, one black wire to the line in, and the other black wire to the Low leg to the fan. The other wire (High feed to fan) I just wired nutted off, unused.

As always, after taking 15 minutes to get the wires shoved back into the box, the integration with the Kasa app & Alex took like 2 minutes. Works great. I can now control the fan when I wake up at 2 am freezing (or sweating) without getting my tired bones out of bed!

So why only 4-stars? This may be nit-picking, but whoever designed the wall trim plates needs to be fired. This is the 1st time I have tried to use them because I have always used these switches in double or triple gang boxes so needed to buy Decora-type wall plates anyway. Sure, these look kind of nice with no visible screws in them, but they don't WORK!

When I screwed the switch in so it was relatively flush with the wall, the covers would not go on because the little prongs that snap onto the switch to hold it on were hitting the wall. Loosen up the screws far enough so that the plates would securely snap on--and there was a God-awful giant (well, 1/16+" anyway) gap between the wall and the plate.

I tried for a happy medium--and finally came to the conclusion that it was BS to even have to mess with something so stupid. I tossed it right in the trash and popped on a plate that I had. It's the wrong color, but at least it isn't leaving an unsightly crevice in the finished work. I'll grab a white Decora plate next time at HD.

Sooo.....great functional switches, I'm sure I'll buy more; I'm also sure I'll be tossing the supplied wallplates right in the trash.

Switches installed easily, app installed easily (iOS), programmed easily, integrated easily. Only possible issue is that, because it's programmable, this isn't a traditional rocker switch: It's a push button on/off. It's not like a light switch where you can quickly physically see whether it's on or off: At night there's a white circle on the bottom when it's off but that's a visual cue. Just be aware.

I was skeptical of these after reading some mixed reviews about their compatibility with Apple HomeKit, but i gotta say I've had zero issues, zero delay over WiFi, almost instant switching on/off, even from control center with the app closed. However, be warned, these switches, along with all smart switches do require a neutral wire available in the switch box to power the smart switch, this may or may not be present depending on when your house was built/ by who. You can get around this by simply putting the switch neutral wire to the boxes ground wire, this will work but is NOT recommended as using a ground in place of a neutral to power the switches electronics is not up to code or considered all that safe (but it will work). Do also note these switches are rated for 10a (general use) so plan on using a relay if you have massive flood lights. Also only works on 2.4ghz WiFi

I purchased the 3 pack Kasa switches. The biggest reason was they were UL rated. They were easy to install and connect and work well with the Kasa app and Alexa. The only thing I did not like is they are different then a normal rocker switch. That is, rocker switch's click on or off. This is a touch switch, It never changes it's position. In my case I use them to control my outdoor lights and you as a touch switch it's easy to walk by and turn the light off or on. It does have a glowing light on the rocker that is lit when the switch is off but during the day you can't see it. It might be minor but it's something that could be an issue. I will have to get use to it. It only uses the Kasa app, so if you have other company plugs like I do you will have to use multiple apps. The operation is good, it's UL and it works, neutral wire needed, so make sure you have it.