Received mine today (saturday) in Texas. Was able to say adios to my Hunter Pro C and install Iro in 2 hours or so. Wifi sync gave me trouble, RACHIO support were nice even on a Saturday and helped me. Instead of tablet tried a phone and it worked like a charm. Also note that you can do the wifi sync up inside the house (instead of garage) if it is comfortable for you. Also doing in a dark room helps as well.
Just naming the stations with whatever name I wanted made a big difference for me. Happily ran the stations one at a time and named them.
My old controller had master valve as well as a wireless rain sensor. For now have not connected the rain sensor
Thanks Rachio. So far like what I have seen
PS: I named all the cables using a label printer as #1, #2 etc. and took photos as well as marked the details on the Hunter Pro C manual as well. Hunter's manual was also pretty good in marking the various connections.
My builder had put all kind of color cables.