I installed a Rachio 3 pro version about 1 month ago. The pro version is the same as the regular version but has a 4 year warranty. I purchased from the link below. They sell the 6 zone Rachio 3 Pro (6ZULWC-PRO) for $137 delivered. They also have bundles with flow sensors but I did not investigate that.
I did the installation myself, and found it easy and fast. I have the Rachio app on my ipad. It is mounted in my garage (where my old Hunter unit was), and I have had no issues with wifi. The app is very well constructed and easy to use.
Rachio R3 6-Zone Indoor Pro Series Smart Wi-Fi Irrigation Controller (6ZULWC-PRO) | Backyard Landscape Supply