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Absolutely.  Think of Upgrades.
ZFS, boots into something called a "Boot Environment(BE)".  It's your root filesystem.
Now lets do an upgrade.
Create a new BE (starts out as identical to your current root filesystem)
Apply upgrade into new BE (now your new BE is old root plus upgrades)
Reboot into new BE  (now you are running the updated system)
Reboot fails for some reason, reboot into the old BE and you have a running system.

ZFS BEs are "system upgrades done right".

So yes, if ZFS is an option, run it even on single disks.  I'm saying this as a general rule, not just OpnSense.  Any system you can run ZFS on, do it.  Your future self will thank you.

I'm in a similar position, as for import, what I've found is manual is best.
Browser with pfSense gui up, Browser with OpnSense gui up.
Walk through the sections and configure things.
The OpnSense GUI is different from pfSense but after using, I think the layout is more logical on OpnSense.
The biggest problem I had was enabling DHCP Server on LAN interface;  I couldn't get the DnsMasq/KEA working, but ISC DHCP worked fine.  I know the problem is "me" not the software, so grain of salt.

I'd like logout to be a bit more global, but there are a few threads here that imply future versions of OpnSense will have it changed, so I can wait.

One of the items on my "to try" list is OpnSense on NetGate hardware.

Moving home network stuff to OpnSense from pfSense.
Relatively simple config (a config converter would be nice, but I'm not expecting anyone to sign up for it, so all good).
My biggest problem was figuring out how to enable DHCP4 server on LAN;  a lot of it due to me looking for pfSense stuff in the web interface.  But once I stopped doing that, relatively simple to configure. 
I had the advantage of the live pfSense system I could bring web interface up on and walk through pages.

I think the web interface on OpnSense is more intuitive/logically grouped than pfSense.
Feels a bit snappier too.

Anyway, just wanted to say "good job and Thank You" to the devs

Thanks.  Searching led to older threads implying all that, test booting of install media yesterday showed issues so figured I'd double check.

I have a device that has RealTek 8125 2.5GBe devices on it.  Booting into the installer for 25.1 it looks like the devices are not detected.  I'm assuming using a supported USB to ethernet dongle to install and then pkg install something will correct this.

Is this a correct assumption?

Thanks.