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It is an excellent switch and I have attached 3 lights and one fan of my bedroom to it. It is working very stable with eWelink and Google home from my mobile phone. I am enjoying to operate switching remotely.
Before now, I have installed about 10 other SonOff 1 channel devices around my house (mainly I hardwire them to light switches). I had a room that had 2 sets of double light switches so I decided to go with a 4 channel as it's cheaper than 4 single channel devices. I was very surprised at how substantial this version was built compared to the rather cheaply made single channel sonoffs. Setup was easy (though for all my Sonoff devices I find that it's easier and faster to pair the sonoff with the eWelink app using the "Compatible Pairing Mode AP" option rather than the Quick Pairing Mode. Once the devices were paired in my eWelink account, I went over to my Alexa app (that's already linked to my eWelink account) and it immediately found and added the 4 new devices