A muzzle brake on a 5.56 AR may not be necessary but, a good one helps you keep the muzzle on target during rapid fire and will likely allow more accurate shooting with smaller split times at a given distance. That's my $0.02 anyway...
Here's a quick summary of what I've found from the TriDelta Tactical brake while running it on my LE6920:
-Top port directs energy up to keep the muzzle flat while firing in addition to the two side ports
-No ports on the bottom, unlike some other popular brakes, which keeps dirt/sand from kicking up when firing from the prone
-Same size as the A2 brake so no change in OAL of your rifle-Made in the USA from US steel
-Mil spec phosphate coated, not painted like some others
-No POI shift with the brake vs. the A2
-Only weighs 2.5oz
-Cost. It sells for $48
-No machining marks anywhere on the brake; very smooth appearance inside and out
-IDPA/USPSA competition legal
-30 day, 100% satisfaction money back guarantee
-It's slightly louder than the A2 (still not as bad as many brakes out there.
-It doesn't come with a crush washer. Not a big deal but just putting it out there so people know when/if they go to order one.
All in all, it's an effective brake at a cost under $50. I haven't had the chance to fire it at night but I'd imagine there is some trade off in terms of muzzle rise vs flash suppression as there usually is with most brakes. I was shooting cheap Silver Bear in the video below and a fire ball was visible with both the A2 and the TriDelta Tactical brake due to the lack of flash suppressants in the ammo.
Here's a video of me shooting with the TriDelta brake and the A2 using the same gun (Colt 6920) and ammo (55gr Silver Bear):