Cheap and Durable/trustworthy do not fit in the same bracket. Eotech Aimpoint etc have the fans. I own both and like them almost the same. Battery life? Aimpoint hands down. View? Eotech hands down. Controls? Have to go Aimpoint. Have to find batteries in a SHTF situation? Eotech with the AA battery.
Bottom line, don't trust anything to anything made in China. Save and get the best, you'll thank yourself one day.
I have a ATN Digital on mine for 3-4 yrs now,holds zero,have'nt replaced batteries yet and has multiple brightness settings and a bunch of different recticles.
By no means is it a battle sight but for the range it works well.
Anyway, I had a 42mm red dot made by BSR that I bought new on Gun Broker for $40 about 10 years ago. It looks identical to those offered by Nikon, Barska and Tasco. It lived on an AR15 for 5 years without a problem before my nephew confiscated it and put it on a Deer Shotgun for a couple of seasons. It has been on his muzzleloader for the last three years and is still ticking. I really don't see what a low-recoil gun like an AR could do to one anyway.