A few think jump to mind looking at this brake. We fit a lot of brakes so this all come from personal experience and not just parroting info read elsewhere.
With a universal design I suspect the exit hole is going to be way oversize to prevent bullet strikes. This hurts efficiency.
No way to get the exit hole dialed in on the bore like a brake threaded and fitted by an experienced accuracy smith.
A clamp on is going to mark up the end of the barrel pretty good.
A clamp on tight enough to stay in place is going to constrict the bore. That may or may not affect point of impact.