Firstly they do not in any way effect the performance of the rifle in a negative way, except for as stated a slight POI change either on or off.
the size (as we all know LOL) is an issue! a few smiths over here make them, pretty light too 320 grams for some, but it is the issue of the OAL of the rifle, that concerns me too.
I have one on my 223 had it for years, heavy too, 2.2 lbs!! would I change it? NO, cause it doubles as a batton when I run out of ammo
But seriosly, they have their place sure, its on my 223 because I shoot rabbits on lifestyle blocks for people and neigbours get a little pissed with a boom, not so much with a suppressor, but the super sonic crack still gets peoples attention.
A mate wants one on his 300 RUM because he has a dog, you think its bad for us!! poor old pooch cant stick his fingers in his ears or put on muffs and how much more sensitive is their hearing to ours.
Ive considered one for my Lapua but after seeing one and laughing my ass off I decided against it, the OAL of the rig was almost as big as me!!! muzzle break and ear plugs are way easier.
However the flipside to it is that they dont have to be on all the time, they are fairly compact and sturdy and they screw on and off easy, on risky thing is losing the thread cover on the barrel. long range shots are rarley rushed so you have time to do all this, BUT for the big cals I still advise wearing earplugs if you can/want to.
If you think it will make you more comfortable shooting, go for it its your rifle and ears after all.