I run 8 sonoff r3's with tasmota, 2 pow r2's i havent flashed yet and over december setup a d1 mini + relay sheild + reed switch for my garage and front gate (no reed on gate, need to find a suitable place to mount it)
If anyone is thinking of getting a Sonoff SV for gates / garage I'd recommend the Wemos D1 - a lot easier, micro USB powered and always in flashing mode. Runs tasmota just fine (see:
https://www.inspectmygadgets.com/wemos-d1-mini-garage-door-opener/)
Anyone running Home Assistant? Very cool - I've got my alarm (paradox), Sonoffs via eWeLink as well as Tasmota's, Hikvision cameras, Arlo cameras, chromecasts, google speakers and even my inverter (scraping the json feeds from the inverters web uri) all set up nicely - highly recommend checking it out. Once you've got your head around the configurations it can do a lot without having to build your own app / UI's.