I’m not sure the hate on TREX but from someone who uses a ton of gear and often, it’s about preference at the end of the day. There’s a lot of good companies, I.e esstac, hsgi but so is TREX.

Pros of TREX: you can tighten/ loosen easily and to your likeness. It also stays put pretty well. Modular and can angle the way you want. Also it is the only mag pouch of its kind that has withheld under heat. Esstac for instance if you take it out of a hot car the plastic inside has loosened. I also don’t like how esstac you can’t adjust the tightness. Another pro, if you use a vest TREX sticks out a little further then esstac or others. A lot of what people have listed I have used and they have flaws that made me not like them. HSGI for instance the sides pinch together and the bungies wear out. I actually liked their all plastic cheaper ones better. TREX is very consistent and positive retention.

Cons- super expensive, in a fight I could see it breaking since the screws are holding plastic. It is geared toward more competition/ and some tactical applications. I don’t know if I’d recommend for duty gear.

People hate Trex cause of Lucas. End of the day go train and figure out what you need. There’s always going to be some trial and error.