I have a similar question but for a wifi USB adapter I ordered yesterday (with RTL8811AU).
What are your real transfer speed in both 2.4 and 5 GHz bands ?
I often copy large files to my phones from a LAN server and have between 14 MBps (Mikrotik wAP ac) and 24 MBps (ASUS RT-AC68U). I guess I will have way less with my BRUME.