they're magical. let you spot your own trace. but extraordinarily obnoxious. i don't use them unless everybody is using them.
They have become par for the course here as is guess 50+% of the rifles you see at the range have them.
I make a point of letting everyone know when one of my larger braked rifles is going to go off, but for the most part we're all so used to dealing with them that it's just second nature not to get to the sides of a braked gun. Everyone's also getting better about not touching off shots with someone in the blast zone.
I have an equal number of brake and unbraked rifles at this point... Or I do in my head anyway....
And I rarely carry one of the ones that has a break when hunting with anybody else. If I am carrying a braked rifle I'm the only one carrying a rifle and they have strict instructions not to get to the side of me and to put in hearing protection or at the very least cover their ears.
Having touched off a few rounds with braked guns and no hearing protection I actually don't find much of a difference with side brakes that don't face backwards somewhat. Radials tend to blast down as much as to the sides and up and I think a lot of that comes back at you in shockwave dust and debris. That said now if I have a chance to put in hearing protection for any shot I'll do so, and I may pass on a shot if I know I'm going to get blasted from my own brake.
I've also played with muzzle weights/linear compensators that are pretty close to the same as the brake. And at least for me they seem to do a decent job of keeping point of impact the same or within an easily adjustable distance.
Brake for goofing off, linear comp for hunting with friends. again not something I had opportunity to try a bunch but it seems like a decent way to work it