I lost WiFi once with the ASIAir Plus. I had to reboot it to get the WiFi SID to broadcast again. There are still a few annoying UI bugs that I wish would get fixed. Otherwise, it seems OK so far. I have to say that the quality seems to be getting worse with each update however.
Another issue is if I turn on the AM5 first, the ASIAir won't boot. I have to turn off the AM5 and wait for the Air to boot up before turning it back on.