UniFi Air is ok as long as your location has decent line of sight to the cell tower. You can use cellmapper.net to check the location and direction of towers relative to your location.

UniFi Air is not the same as UniFi Bebas. It does not use Band 5. Band 5 is meant for the GSM component (i.e. phone). UniFi Air only works on Band 40 - not sure about 38. The best way to describe this is, mobile data is based on 4G-FDD while UniFi Air, which is Webe which is P1 WiMax, is using 4G-TDD.

For Modem, difference between 4G and 4G+ is Carrier Aggregation. To get 4G+ speeds, you need a minimum Cat.6 LTE modem. In bad or less than good coverage areas, not sure why, but Cat.6 modems will lead to significant improvement in speeds.

UniFi Air's biggest problem is upload speed which is not good. It is sufficient for a full day Zoom Group meeting - so not too bad.

UniFi Air is better than Maxis WiFi Go as 1) It does not have the 300GB fair usage policy, 2) It does not throttle based on time of day, 3) Torrent works, 4) Its much cheaper.

Maxis WiFi Go is better on coverage, upload speed, and higher peak download - if you have mission critical tasks that require strong internet, Maxis WiFi Go is safer bet.

Neither are good if you have multiple users.