I have a boss on a Browning. Never had a problem with it. In fact I have killed numerous deer while wearing no hearing protection with it and never had any ear issues. Also shot a few game animals with experienced hunters at my side without hearing protection, never once did anyone mention any ill effects from the braked rifle. Not concerned with how loud it is at a range as I've also never been unfortunate enough to need to shoot centerfire rifles at a public range. I have found many like to bash brakes on the internet when in fact few have ever had true experience with one. Would I recommend them on all rifles? No. They certainly serve their purpose on some calibers for some people.
