At first I didn't get how he connected Raspberry Pi to the weather station instead of original Davis console. Turns out there are separate gadgets for connecting the sensor suite to a router either via WiFi or cable: http://www.ambientweather.com/in.html and that takes care of uploading the data to WU. The kit he bought must've included such a link.
It's possible to build your own USB cable to interface with the Davis indoor module. We did it following instructions we found on a forum. The headers can be fiddly, but once we had it running and strain-relieved, it's worked great.
We're happy with the Vantage Vue. It delivers weather telemetry and hasn't failed after several years measuring the elements.
