The AK on the left has a Bushnell Trophy on it. It didnt last much more than 500 rounds before it started having problems. It also had a couple of different reticules that would not hold zero between them when switched.
The AK on the right had a Tasco on it. That actually held up OK, until the gun slid off the seat of my truck onto the floor of the car port. It was instantly obvious that its zero was off, and when you shot it after the fall, you had to keep fiddling with the switch to keep the dot on.
Both guns now, and if you pick one or the other, each has more rounds through them now than both did in the first pic combined. Each is also on, 24/7/365, and gets its battery changed once a year, whether it needs it or not.
If all you do is take the gun out of the safe and to the range once in awhile and shoot a box or two, the cheap sights will "probably" be OK. If you leave in bouncing around in the back of your truck, and treat it less than gentle, I'm betting it doesnt hold up as well, if at all. And make sure you buy lots of batteries. Most of the cheaper ones eat them like candy, especially if you forget to turn them off.