Unifi air user for past 1 month here. Sharing my experience at my area(Kuala Terengganu)..

Band 40 to be quite poor during evening time(8pm-12am), around 4mbps only. Other time its really fast, I can get like 50-60mbps.

However if I lock to only band 5 during the evening time I can get quite stable 15-20mbps speed.

Ping is bad for gaming though. I get like 500ms playing wow private servers. So I just buy the hotspot rm5 with my main phone line(hotlink rm35 package) and when I game I use my main line for that. Hotlink give me like 300ms for wow which is bearable for me.

I'm using Huawei B818 router if anyone wonders.