A lot of opinions exist on the brake issue, as seen by the replies here. They do work. They are loud. From an aesthetics standpoint, they are not attractive; but, beauty is in the eye of the beholder. But, if you take one hunting, you should take along hearing protection of some sort. If you shoot one without protection, you will never forget it.
Some negatives about brakes carried in the field may include:
1. If shooting prone, the blast may kick up dirt and debris into your face, depending on the angle of the holes in the brake and the ground around you.
2. If you have a screw on type brake, it might come loose and fall off your gun. It has happened.
3. If you have to shoot quickly, you may not have time to put in/on your hearing protection. It will hurt accordingly.
A positive:
In open spaces of the west, a muzzle braked gun report is spread out so much that animals cannot always detect its origin. Some hunters have reported that animals will just stand around after the shot. Not a big deal, but it may allow a second shot if the first one was a miss.
I know. We never miss. At least not that we will admit.