A few days ago I replaced my C-5 that has been in service for (I'm estimating) 2+ years. Generally the C-5 has been very reliable. I was a little reluctant to upgrade since it really didn't seem necessary. I bought a C-7 when it was released. Other than powering it up to register and using it to test a couple of devices from time to time, it has sat dormant on my workbench.
Following the directions in the Hubitat migration video, I had no problems with the process. Some of the devices and automations were a little slow to respond. After a couple of days with everything having time to settle, I would have to say that pretty much everything is noticeably faster. Also looking at the routing table, the vast majority of my devices are now communicating directly with the C-8, including some in my detached garage. This in itself is pretty impressive since my hub is located in the basement of the house.
I would have to say that this upgrade has been easy, without problems/glitches and a great improvement for performance. I'm quite pleased!
Everything moved over without a problem. The SNZB-03 is misbehaving, but I only have it as a test device and it's showing a battery of 1%. I was able to exclude and then reconnect it to the C-8. It was showing motion always active according to the hub, but I think it may be fine with a new battery. All the other devices have been working as they did with the C-5.
EDIT: I did just notice that the battery powered Zigbee devices are not reporting battery level on dashboard tiles. They are showing on their respective device property screens.
I'm in the same boat, what did you do with your c5 and c7 now?
Debating if I pull the trigger on the C8, and if so, do I keep it was failover backup from my C5, or do I go C5->C8 and maybe use my C7 as an app Hub? Too many choices
I expect I'll likely keep them kicking around. More likely than not, I'll pick-up another C-8 as a spare. It would be difficult, particularly on my elderly mother, to adjust quickly enough if all the automations she's become accustomed to came to a screeching halt. This would limit downtime instead of moving backwards one or two versions of hub. When (that is IF) I ever find enough time, I would like to work more diligently on writing some code. I expect to use the C-5 and/or C-7 for testing.