As with many products, be prepared to be disappointed. I own several GL iNet routers, and although all are still supported, not one of them has received a released version of 4.x firmware, and they all are using OpenWrt 19.07 as the base firmware, which was declared End-of-Support in April 2022 and is no longer maintained or actively supported by OpenWRT. @alzhao in a post in early 2021 said that the 4.x firmware would be available by mid-2021, which I am still waiting for a released version for any of the routers I own. Since 19.07 is no longer actively supported, it is very hard to know if there are any current exploits in the firmware. Randomly, I have to reboot my travel routers, as they lock up from time to time.
Hardware wise, I have modified almost all my routers by adding a drop of epoxy to the micro-USB connector, as these connectors are known to shear off from normal use. This connector is only held to the circuit board with a small solder pad. Looking at both Amazon reviews and posts to this forum, people have had these connectors break while on travel, which should not happen on a device sold for travel.
My AR300M routers that I use as VPN servers have had to be modified, as I needed to support multiple VPN protocols, which is not a feature in pre 4.x firmware. This took hours of custom script writing and some interesting manual installation of some OpenWRT packages, but I now have small VPN servers running multiple VPN protocols on multiple ports, that reboot themselves daily, and have been very stable.
My general rule is not to purchase any GL iNet products that have not been on the market for at least a year, and to only purchase products that have a released version of OpenWRT (not just a snapshot version). Products that have a released version of OpenWRT just seem to work better for me.
Do I use their products, yes. Why? Because so far, I have not found anything better, but my newest product from them is an AR750S-EXT, and this probably will not change for some time.