The WeatherFlow is a 3 piece solid state system (no moving parts). A hub, Air (temp, humidity, pressure, and lightning strikes) and Sky (wind, rain, light). They are still in final design testing for the Sky unit. I received the Hub and Air units. Install took all of about 15 minutes and has been working and uploading data to WU flawlessly. However the system doesn't work with my Rachio without the Sky sensor. Personally I'm ok with waiting for a product that will work correctly especially since I've winterized and won't need it till next spring anyway. If you'd like a look at the data here's some links:
Any other questions, don't hesitate, happy to share and or help.