I'm stopping with the proprietary wifi drivers - they are good if you want a simple setup and the performance is better, but the missing features are a deal breaker for me. Please let me know if any of these are working for you, maybe I just didn't figure them out.
Proprietary drivers:
- Get better speeds
- Have marginally better range
- Don't support multiple APs on the same frequency (e.g. guest network)
- Only support wireless Mesh (FT over DS isn't supported)
- Don't support 802.11r fast roaming for hand-off between APs
The open source drivers have their own quirks, but hopefully will improve.
- Stable at AC speeds on 5ghz
- Proper wireless handoff using 3 APs with FT over DS
- Allows setting up a guest network on its own VLAN
- Can leverage usteer to instruct client roaming
- AX was a little flaky for me when doing hand-off between APs
- Slower speeds than proprietary driver (still getting 400 mbit in most places around the house)
I'm still playing to get the best settings, but since I don't need gbit speeds over wifi - the open source driver is more suited to my needs.