About 3 years ago I tried upgrading from 5 to the newest UI and it failed miserably. Nothing worked. Had to contact support and roll back. It was a big pain in the ass. After I got rolled back I let my system sit, untouched for almost 3 years.
That all changed this week when I bought a zwave plus device and read that I needed UI7 to use these devices easily. UI5 would not even adopt the device. With my past experience I was extremely hesitant but I had just bought the new Aeon Labs Smart Switch and was excited to use it, so I decided to take the plunge.
I started the upgrade after backing up my old config. The upgrade failed saying that I had to reset to factor then restore. Scary, but I did it anyways.
Upgraded no problem. 10-15 min later up and running on UI7, looks awesome! Time to restore backup. After another 5 min the backup restored. All my devices were loaded.
My thermostat actually looked like it worked. I have a minimote, the scenes worked. I have ge switches that when turned on trigger scenes. Everything seemed to work, I was thrilled!
Next day, none of my auto scenes triggered. Dug around on the forums and found that you have to edit them to “this scene runs” and pick a mode, home, away, etc. After doing that they worked flawless.
My Aeonlabs Smart switch finally linked to the vera but it still is not switching properly and I am having some issues with my user name but I have a ticket into support.
Long story short, I was hesitant to switch to UI7, I was nervous of what would break after my experience and what I read on the forums, but after upgrading, I have to admit it was extremely painless and well worth all the features UI7 added. I am glad I upgraded.
Good luck with you upgrades!