So, my usual claim is that IPv6 is annoying because you have to set up a totally parallel network network to IPv4, so you have twice as much work and then twice as many ways it can go wrong.
On the other hand: I had trouble finding my device on the IPv4 network today (DHCP network renumbering; yeah yeah, spare me the lecture, IPv6 renumbers too). I was able to reach it by its old IPv6 address to futz with the DHCP client. So in this case, two parallel networks was an advantage: it provided redundancy.
There. That's your "fair & balanced" reporting for today, just in case you thought I was only opposed to IPv6. (Although I am.)