I look at them as a "better to have and not need" piece of kit. Yeah, RDS and Holo sights are damn near bulletproof these days and as long as you change batteries every so often, they "shouldn't" fail. But in the If and when case it does fail for some unknown reason and you need irons, I feel like you'd want them pretty bad instead of playing the "maybe I should have" game.
I tend to move towards the polymer Magpul MBUS myself since the additional weight is negligible and they are there as an emergency use only. Again, better to have and not need in my opinion and it's not really taking away anything save another $80 or so you add for peace of mind that you do have something if you really need it.
Now, offset sights are an entirely different subject...
Experience is a cruel teacher, gives the exam first and then the lesson.
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