While I don't feel a burning desire to have a C-8 just for itself yet, I am a little nervous about my hub as a single point of failure in my home's behavior. I'd love to have a cold standby hub, and I could see ordering a C-8 to be that. That said, it seems silly to have the better hub paid for and under warranty sitting in a box.
If I bought a C-8 and migrated to it, would the C-7 then be usable as a cold standby? That is, could a backup from the C-8 be restored to the C-7 successfully and be back up and running in a few minutes?