I connected my Rachio today and when I got to the WiFI set up screen on my iPhone 6+ with iOs9 installed on it (beta) it simply would not find the WiFI network. Just thought you should know this may be an issue for when iOS9 is released unless it's fixed before the final version.
Beyond that, I tried the set up using an iPhone 5s using iOS8 and it found the wi-fi no problem.
The only thing is, maybe I didn't see this anywhere in your literature before buying it, but the wifi doesn't work with WPA which is the common standard now so I had to switch my wi-fi protection off (it wouldn't let me switch to WEP) in order to use the Rachio!
Just some issues I was wondering if you were going to address in the future??
Looking forward to using it.