I've been using Burris Fastfire III's for years and they're great! So are plenty of others.
I've dropped mine enough to put a small gouge in the aluminum over top of glass and it was just fine.
Of course, if you can avoid knocking your gun over, that would be ideal but they're not a delicate thing.
As far as batteries go, they last a long time, and when they do start getting weak, the dot blinks intermittently for a few hrs. to let you know.
I carry a spare battery and a small screwdriver just in case but never had to change a battery in the field.
Two of the main advantages to them is precise aiming, especially up close with tight patterns and the ability to be all twisted around and not have to worry about cheek weld and other alignment issues. Where that dot is when you pull that trigger is where that load is going.
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