Upgraded my RT-AX58U an hour ago, went from merlin 386.7 + flexcos so i had to install 45898 before installing 49674.
Dirty upgrade merlin 386.7 -> Asuswrt 386.45898 -> Asuswrt 386.49674 went well but i still did a factory reset (i am on vacation so i got the time
). One hour in, the only thing i noticed is the 49674 gui feels very very snappy, could be the factory reset though.
I use:
AiProtection
Adaptive QoS
DDNS
OpenVPN
Also activated all mu-mimo (ac+ax mu mimo) and ax features (dl/ul ofdma +mu-mino + wpa2/wpa3 authentication) despite having only ac clients. I also use fixed wifi channels, 11 on 2.4G (i got 15-20 2.4G wifis around me) and 36 on 5G (living 9 km from the airport).