You don't actually have to have the hub with Acurite as long as you plug the acurite home panel into a computer that is always on. I did end up getting the hub so I wasn't dependent on the computer always being on.
You can get the acurite hub - which is quick and easy install. But it only writes to Weather Underground - which rachio still doesn't support. However, there are instructions here on this site to setup an automated script online that will past from Weather Underground to PWSWeather. This is what I'm doing and working well.
You could also create a meteobridge with and old router and the meteobridge software flashed to it. A little more time consuming.
There are brands other then acurite that will post direct to PWSWeather.
Overall now that I have the script copying over to PWSWeather from Weatherunderground I'm happy with the Acurite and Acurite hub setup.