Insite Arms Heathen.
This brake is self timing, like the APA or the Area 419. However, it has a distinct advantage in that the main port is designed to direct the blast perpendicularly to the shooter.
The result is that you get a brake that is self timing and just as (if not more effective) than the APA and Area 419, but with a lot less obnoxious blast directed at the shooter.
Don't just take my word for it - Lowlight has a video review on it, and seems to like it as he runs it on a few of his rifles.