I wouldn't dismiss them, but I'd be very careful and I wouldnt be trying the lower budget ones.
I shoot 3 gun (quite a lot, and seriously), these reflex sights are very very popular in certain divisions in the sport. Without wanting to learn how to calculate it exactly, I can tell you with a fair amount of certainty that a big bore rifle is harder on then than a semi automatic pistol. Even in a slide ride configuration, with light springs and therefore fast slides, as well as hot loads (124gr 9mm going like 1400fps+), it doesn't come close to the abuse of a big bore.
There are reflex sights that are fairly durable on our pistols but will fail commonly on a semi-auto shotgun. This also tends to support my educated guess on a big bore being more violent than a pistol on the optic.
Regardless, however, I have seen many of them fail and have killed quite a few personally. The aimpoints arent popular in the sport so no data there, but the RMRs are very much so and I've never seen one fail. The Leopold's and Holosun have proven very good as well but again, just personally, I trust certain things for national championships but with my life I go with the largest amount of data. I know these are commonly used for self defense pistols too but let's be honest, if you hunt much DG you're more likely to use your big bore to defend your life than a pistol (thankfully)
I'll reach out to my friends at Trijicon and get their thoughts on big bores vs aggressive pistols on abusing the sights out of curiosity.