Just came across your post-- searching Indigo vs ISY994i. I was using Indigo in my last house 3 yrs ago and now getting ready to automate my new house (all Insteon). My old controller no longer works with the new devices (need to buy 20+ to complete the new house). In addition the new controller is unable to upload settings to run the system w/o the computer being on. I do now have a mac mini that can stay on 24/7.
It looks like it has been more than a year since you made the switch. Any updates and recommendations?
Thanks,
Jim
