What about performance and driver support for Linux? Any issues with suspending to memory or disk?

I've got a mix of both running here and definitely prefer the SFP+ part of the world. Couple of neat tricks it enables like the new "invisible" fiber - looks the same like fishing line basically. Unless you're 30cm away and actively looking you can't see it.

Replaced a wifi bridge that way...30m run across multiple rooms & hallway...zero drilling.

I have a RTL8127 NIC from Aliexpress that uses 1 PCIE 4.0 lane, finally a use for those 1x slots and it does pretty good on 10G speeds.

I wish multiple-port 10G PCIe cards with this chip were available. I would immediately upgrade by Debian router from 2.5G to 10G. At the very least I would need a dual NIC.

and the QSW-L3208-2C6T-US is a cheap 8port switch