I've been running the Damage Industries AK muzzle brake for a few weeks now and here's what I've found...
-It works. There are some 'brakes' out there that don't do much to reduce muzzle climb outside of adding weight to the end of your barrel.
-Cost. Sells for only $18.
-Finish. The black oxide finish looks nice and is void of any machining marks.
-Made in the USA.
-Composed of 4140 steel.
-Length. It's only 1.75'' and after threading it on it only adds about 1'' to your OAL. Lots of competitors' brakes out there are 2.5-3.5''.
-It isn't a 'flash magnifier' like the AK-74 style brake.
-It isn't quite as good at taming recoil as the 74 style brake (I'm using the brakes with proper chambers).
-Only available in 14x1 LH threading currently.
-It is loud; not as loud as some brakes but louder than not using one for sure.
In summary, it's a very good brake for the money. Other brakes in its' price range are generally made by Tapco and don't work anywhere near as well. If you're looking for a good brake for your 14x1 AK but don't want to break the bank it's a good option. Here's a video with this brake in action and a quick discussion about it:
Muzzle Brake HD Video Review Link