Pros:
Recoil reduction
Less muzzle flip
Cons:
Flash reduction
I shot 10rds of Wolf MC/HP this evening. Every few shots it throws a big fireball out the right side. I think it's likely on par with the perfomance and flash signature of a 74 brake. Wolf is flashy tho, so maybe I'll try some golden tiger tomorrow evening.
So yeah, the brake ports totally defeat the purpose of the tongs. It could be 1/3 the length and work just as well. But hey, at least it looks cool on my HK-ish saiga and I can rip off double taps while staying on target.