I have 1 C-4 and 1 C-5 Hub on the fence about buying C-7

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There are several issues here. First, firmware releases are still happening. It’s getting better. Biggest issue seems to be the inclusion process.

Second, you will still have to migrate if you get a new C-7. The process is here:

Migrating a Z-Wave Network

Some people are going to find reasons to migrate a Z-Wave network by hand from one Hubitat Elevation hub to another one. There are steps you can take that will make this a little bit easier than just starting over. In particular, one wants to preserve automations that use Z-Wave devices, and not have to redo them. This would useful for migrating from a C-4 to a C-7. For C-5 to C-7, one can use the Hub Protection Service and avoid all of this work. First of all, familiarize yourself with thi…

Third, by moving your same database and devices to the C-7, you might be bringing the issues with you. Some of the firmware releases are helping the stability of the platform as a whole. If your issues are caused by a jabbering device that’s bringing down your mesh, then you will still have those issues. If you have some odd user drivers, those will come forward.

My C-7 still sits powered with no devices, but I’m almost at the point of moving stuff from my C-5, which is fine, to the C-7. C-7 issues do seem to be stabilizing. Not all user drivers have been adjusted to handle S2 inclusion.